KymcoForum.com
General => Technical | How To => Topic started by: norcal1 on September 06, 2009, 06:24:18 PM
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:o
My shop manual for my Grand Vista says to use 15W-40 oil. What little of that weight I can find in this area is for diesel engines though some say it can be used in gas engines too.
The question is why is such a heavy oil needed in a high-revving scooter motor?
(http://i241.photobucket.com/albums/ff96/akenatenflht/IMG_0162-1.jpg)
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...yup..that's all I could find also...the diesel, which I used for a while, in my Agility 50..
..in the case of the A50, I attributed it to the fact thats it's air-cooled, and runs kinda hot..
..I change it about every 500 miles..
..further investigation uncovered a spec of 10W-40..
..I found that on a sticker that's on the bottom of my flip-up backrest/passenger seat..duh...
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...yup..that's all I could find also...the diesel, which I used for a while, in my Agility 50..
..in the case of the A50, I attributed it to the fact thats it's air-cooled, and runs kinda hot..
..I change it about every 500 miles..
..further investigation uncovered a spec of 10W-40..
..I found that on a sticker that's on the bottom of my flip-up backrest/passenger seat..duh...
Hmmm...nothing under the seat.
Guess I'm stuck with the 15W-40.
I have to admit it makes it easier as I have a diesel pickup truck.
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...btw...
..Nice looking scoot!!
peace
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So the diesel fuel will also be completely acceptable with my People 150, right?
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Probably a typo, but oil, not fuel! ;)
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So the diesel fuel will also be completely acceptable with my People 150, right?
..I ran the 15W-40 diesel OIL in my Agility 50 for about 6 months, because it was all I could find in that weight...
..also, on the oil bottle, it states that the oil is safe for gasoline engines as well as diesel..
..I experienced no problems, but I can't say that it's compatible with everything..I just don't know...
peace
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Yeah, I did mean to say OIL and not fuel. My apologies.
I went with the 15w-40 diesel oil today on my oil change. So far, so good.
:)
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Same here - the manual for my scoot reads the same, with no issues...
**knock** **knock** on wood...
/agree with 'Slinger - great looking scoot!
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The MAIN difference between diesel engine oil (ROTELLA), and gasoline eng oil is the cleaning agents added to gasoline eng oil. If your make says it is safe for gas engines then it has been blended for MODERN diesels that cannot run on standard diesel fuel (high sulpher). Hope this helps. Have you tried finding Castrol Syntec? It's the best eng. oil in my opinion.
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The MAIN difference between diesel engine oil (ROTELLA), and gasoline eng oil is the cleaning agents added to gasoline eng oil. If your make says it is safe for gas engines then it has been blended for MODERN diesels that cannot run on standard diesel fuel (high sulpher). Hope this helps. Have you tried finding Castrol Syntec? It's the best eng. oil in my opinion.
..I've been debating with myself whether or not I should switch to a synthetic...I ride daily, 800-1000 miles a month..it seems that this past summer, my oil has been breaking down rather quickly...It's been pretty hot around here too though...Guess it'll be a little better this coming winter..
..What do you find to be a benefit in using the synthetic?
peace
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Without sounding like a comercial... Synth. is designed to take the heat, It has a higher shear strength, and it will NOT leave organic deposits (sludge). I use NAPA full synth. gear oil, and change about 3000 miles (no leaks here) I also use golden spectro 2 cycle (for the past 30 years) w/ no bearing failure, ever..., and in my '87 pathfinder have been using castrol syntec for 375,436.58 miles. I recently replaced the valve cover gaskets, and the valve train looks new. I DO believe in science over dead dinosours!
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I have looked for synthetic in 15W-40 but so far no luck.
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You can bump the #'s up or down a little w/ no ill effects 20w40 15w50 20w50...
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The 2008 kymco agility 50 says to use SAE 15w-40 in the manual, but the only oil I could find at autozone was Diesel oil for passenger cars and light trucks with diesel engines, but it said SAE 15w-40. I also saw synthetic high quality racing 10w-40 engine oil for 4 stroke motorcycles, but I did not buy this.
I correctly changed the oil in my scooter and cleaned the filter using the 15w-40 diesel oil and my scooter sounds, maybe smells, dont know if im imagining it, and doesnt run as well as it did before. There is a large decrease in acceleration and lower top speed, I plan on bringing it into the shop monday, but could i have used the synthetic 10w-40 oil?
Also wordslinger, in your signature, what is the $100 50+mph mod you have on your scooter.
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The 2008 kymco agility 50 says to use SAE 15w-40 in the manual, but the only oil I could find at autozone was Diesel oil for passenger cars and light trucks with diesel engines, but it said SAE 15w-40. I also saw synthetic high quality racing 10w-40 engine oil for 4 stroke motorcycles, but I did not buy this.
I correctly changed the oil in my scooter and cleaned the filter using the 15w-40 diesel oil and my scooter sounds, maybe smells, dont know if im imagining it, and doesnt run as well as it did before. There is a large decrease in acceleration and lower top speed, I plan on bringing it into the shop monday, but could i have used the synthetic 10w-40 oil?
Also wordslinger, in your signature, what is the $100 50+mph mod you have on your scooter.
...i ran the Shell 15w-40 diesel oil for a while...Experienced no ill effects...
..the $100.00 mod was a Malossi Multivar variator with 5.5 gram rollers and a longer main clutch spring...
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Most diesel oils are NOT as refined as gas engine oils... thus the sulpher smell. I would go w/ the synth.
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Just found this interesting write up on what the API standards mean, and all that.
http://motorcycleinfo.calsci.com/Oils1.html (http://motorcycleinfo.calsci.com/Oils1.html)
Search that page for the text: "API Oil Standards", and read that section. And read the following paragraphs under "Commercial (Diesel) Oil". Then keep reading to get more info that you ever hoped to. This fellow states that the "diesel" oil is definitely superior to the "S" rated oils for gasoline engines, and more suitable for motorcycles.
From what I gather, a good synthetic (i.e. "C" rated "diesel oil" synthetic) seems to be the very best choice for the scooters. Why penny pinch when you're only dealing with ONE QUART every couple months or so?
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I had my oil change by the dealer in may and used castrol R4 RS 5w40 1 liter .will that what he put on the invoice. i hope this help
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Just found this interesting write up on what the API standards mean, and all that.
http://motorcycleinfo.calsci.com/Oils1.html (http://motorcycleinfo.calsci.com/Oils1.html)
Search that page for the text: "API Oil Standards", and read that section. And read the following paragraphs under "Commercial (Diesel) Oil". Then keep reading to get more info that you ever hoped to. This fellow states that the "diesel" oil is definitely superior to the "S" rated oils for gasoline engines, and more suitable for motorcycles.
From what I gather, a good synthetic (i.e. "C" rated "diesel oil" synthetic) seems to be the very best choice for the scooters. Why penny pinch when you're only dealing with ONE QUART every couple months or so?
..the only thing is, scooters have a completely different transmission than the bulk of motorcycles...The oil does not run throught the clutch / transmission...
..at least not if your seals are all intact... ;D
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Look, I found a synthetic 15w40!
http://www.motosport.com/dirtbike/product/TORCO-T4MXR-1540-SYNTHETIC-OIL/?catalogId=106927 (http://www.motosport.com/dirtbike/product/TORCO-T4MXR-1540-SYNTHETIC-OIL/?catalogId=106927)
Not sure though if I want to spend $10 + shipping on a bottle..
I would still like to know what people who didn't want to use the Diesel engine oil used instead. 10/40?
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Not sure though if I want to spend $10 + shipping on a bottle..
I pay $16 a quart for full synthetic 2-stroke oil at my local shop!
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..the only thing is, scooters have a completely different transmission than the bulk of motorcycles...The oil does not run throught the clutch / transmission...
..at least not if your seals are all intact... ;D
Right. I understand that. But the point is, the commercial rated oil (i.e. "diesel oil") will withstand the extreme shearing issues related to the "wet clutch", which tells you it is a far superior oil. Using "diesel oil" in the scooter would be better for the scooter than using standard oil. Using synthetic would be even better. And running synthetic diesel oil would be your very best choice.
Three synthetics stand out from the rest: Mobil Delvac 1, Mobil-1 SUV and Shell Rotella T Synthetic. These are C certified industrial oils meant to be purchased in 55 gallon drums and used by companies which run a lot of diesel engines. The Commercial oils, as discussed above, have more expensive additive packages which are meant to prolong engine life and oil life, as opposed to being cheap to buy at Pep Boys and helping the car companies meet their CAFE requirements. These oils meet all the automobile requirements through SJ, and also have extra additives to help pick up gunk in the engine, to keep the oil from becoming acidic, and to maintain the oil's viscosity over a long time. In fact, the manufacturers talk about their oil's viscosity resistance to shear forces - exactly what a motorcycle needs. Shell Rotella-T Synthetic is available at Wal-Mart for $13 / gallon, so I consider this the motor oil of choice.
As far as the "weight" numbers go, don't get all freaked out. You're not going to destroy your scooter if you use a 10W-40 instead of 15W-40. The number is more a factor of the temperature than it is a strict manufacturer's requirement - if you live in a colder climate, get 10W-40, if you live in a warmer climate get a 20W-40 or whatever. The "W" number is for when temperature is below 80 degrees. Once you warm up the bike, you have 40 "weight" oil, no matter what the "W" number is. And if using synthetic, it's even less strict a requirement because the synthetic has a higher film strength and stays stuck to the parts longer and better after shutdown.
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Right. I understand that. But the point is, the commercial rated oil (i.e. "diesel oil") will withstand the extreme shearing issues related to the "wet clutch", which tells you it is a far superior oil. Using "diesel oil" in the scooter would be better for the scooter than using standard oil. Using synthetic would be even better. And running synthetic diesel oil would be your very best choice.
Three synthetics stand out from the rest: Mobil Delvac 1, Mobil-1 SUV and Shell Rotella T Synthetic. These are C certified industrial oils meant to be purchased in 55 gallon drums and used by companies which run a lot of diesel engines. The Commercial oils, as discussed above, have more expensive additive packages which are meant to prolong engine life and oil life, as opposed to being cheap to buy at Pep Boys and helping the car companies meet their CAFE requirements. These oils meet all the automobile requirements through SJ, and also have extra additives to help pick up gunk in the engine, to keep the oil from becoming acidic, and to maintain the oil's viscosity over a long time. In fact, the manufacturers talk about their oil's viscosity resistance to shear forces - exactly what a motorcycle needs. Shell Rotella-T Synthetic is available at Wal-Mart for $13 / gallon, so I consider this the motor oil of choice.
As far as the "weight" numbers go, don't get all freaked out. You're not going to destroy your scooter if you use a 10W-40 instead of 15W-40. The number is more a factor of the temperature than it is a strict manufacturer's requirement - if you live in a colder climate, get 10W-40, if you live in a warmer climate get a 20W-40 or whatever. The "W" number is for when temperature is below 80 degrees. Once you warm up the bike, you have 40 "weight" oil, no matter what the "W" number is. And if using synthetic, it's even less strict a requirement because the synthetic has a higher film strength and stays stuck to the parts longer and better after shutdown.
..Yeah, as I said before..I used diesel oil for a good while, I wasn't trying to dispute your point at all...
..I just threw that out there so some of the newbies might not get confused...as I once was...
peace
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From 1992-2000 I was many times involved in "oil quality" discussions on BBSes, and then it continued on Internet. It is quite possible that using synthetic oils might prolong useful life of the engine. The issue is that I never use the vehicle until the end of the engine's life, I usually drive motorcycles and scooters from 0-25.000 kms and then sell them away.
Where I live, I liter of fully synthetic oil is 24 US$ upwards.
For unknown reason, one shop offered fully synthetic oil for 6 US$/liter and yesterday I bought 2 l for next changes.
It is interesting that on the average you can expect such price for mineral oils here, and semi-synthetics are around 12 US$/liter.
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I have been using Rotella 15 - 40 Full Synthetic in the scoot. Found it at Walmart, but you have to look hard, they used to carry the gal jugs not just one row of quarts way down at the end of the oil asle. Wish they would carry the Castrol Syntec but they don't carry it in ether 10 - 40 or 15 - 40 :( .
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..Yeah, as I said before..I used diesel oil for a good while, I wasn't trying to dispute your point at all...
..I just threw that out there so some of the newbies might not get confused...as I once was...
peace
Cool. I debated discussing the 'wet clutch' issue, but I'm so darn wordy already, so I decided not to hit that subject too. It's good you mentioned it.
I found some Rotella-T full synthetic in gallon jugs at Walmart here today for $19. Who knows if they will have it next week. I believe it's 5W-30. I'm thinking about running that in my scooter now that the weather is getting cool/cold. It's full synthetic "diesel oil".
The owners manual for mine says 15W-40. (Owners Manuals are all about "Keep it simple" - i.e. "people are stupid, don't confuse them with choices". lol.) The factory Service Manual says "10W-30 or 15W-40." Then it says "use appropriate type of oil with viscosity satisfying the atmospheric temperature in your riding area based on the table shown". The little chart has all sorts of weird ratings. From straight 10W for below freezing, to 20W-50 for freezing thru hot weather. And a narrow temp band for straight 30 and then straight 40 if its always hot. Moral of the story: Don't obsess on strict "15W-40" (unless your warranty strictly requires it, of course.) Scooter will be happy with thinner oil in the winter.
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..been using 10w-40 since I stopped using the diesel..The main thing is....change the oil frequently...especially if you ride every day...these little air cooled engines get pretty hot...oil breaks down rather quickly...
;D
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Howdy,
I rode my Daelim S2-125 about 500 miles/month for one year. I used Shell Rotella from my local "big box" with no ill effects. Should I get an People S200, I'd consider either the Rotella or a good Synthetic.
Eggman
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here in MN 15w-40 is available, its just called "snowmobile oil" - I've been using that in my scoot for over a year with no prob
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here in MN 15w-40 is available, its just called "snowmobile oil" - I've been using that in my scoot for over a year with no prob
Why is it called so? 15W is not low enough to be considered oil for low temperatures.
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I have been using the Rotella and Delo diesel oils and they seem fine and you can get them at the Wal-mart. I have considered getting the gallons but when I buy the quart/liter at the WM, after i drain the old into an oil milk jug, and add the new to the crankcase... I have an empty oil bottle to recycle the used oil in my hand.... kinda convenient... I pour the darined oil into the empty and set it on top the garbage can and the county garbage man does the oil recycling for me.
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I dump mine in the ocean, and without fail it is always gone by the next morning! It seems to work for all sorts of things you just don't want anymore. My wife keeps coming back tho~ Just kidding Guys/Gals!
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....rotflmfao....
;D :D :) :D ;D :D :) :D ;D
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Ok, for this oil change, I went to the place I got the scooter the guy there sold me what he said would be the best stuff. It's Maxima Premium4 High Performance 4-Cycle Oil SAE 10w-40 Petroleum.
Any thoughts as to this? I haven't put the oil in my bike yet.
Oh, and the same dude said I shouldn't put Synthetic in my scooter, but he talked about the transmission thing and I was under the understanding that wasn't an issue.
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Maxima is a highly rated oil. I have never used it though. I like the valvaline havaline prodects for regular oil. How many miles on the scoot? Curious why synthetic was not recomended. It is not necessary but Any hedge I can get I'll take.(after break in of course)
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Amsoil full synthetic. Since these scooters use so little to begin with any helpthese motors get will extend their life. Some bike shops carry it, otherwise just order online. I am not affiliated with Amsoil. I use their oil in my motorcyles and scooters. The Tacoma gets Castrol syntec.
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Dunno, but I'd like to say, Norcal, that white GV of yours is one BE YOUTIFUL machine ! ! !
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most motorcycle companies want you to use their oil just for motorcycles... the scoop on diesel oil... automotive oil has more detergent than motorcycle oil OR diesel oil and can cause foaming, just a little. diesel oil is the prefered non factory oil for H-Ds
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..i ran prestone diesel oil in my scoot originally, because it was the only oil i could find in the weight that the owners manual specced out....
..when i lifted the backrest, and read the specs that are stickerd there, it said use 10w-40...
..been using Royal Purple full synthetic for over a year...
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For the most part they are all made by just a few manufacturers. Less detergent is better for our one lunger motors.(no foam)
I like synthetics for our scoots. Hell its less than a quart why not!
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I like synthetics for our scoots. Hell its less than a quart why not!
..lol..i know right!!??...
..there are alot of good oils...
..the key is selecting a good one..and sticking with it..and change it often...
;)
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Ok, for this oil change, I went to the place I got the scooter the guy there sold me what he said would be the best stuff. It's Maxima Premium4 High Performance 4-Cycle Oil SAE 10w-40 Petroleum.
Any thoughts as to this? I haven't put the oil in my bike yet.
Oh, and the same dude said I shouldn't put Synthetic in my scooter, but he talked about the transmission thing and I was under the understanding that wasn't an issue.
I just noticed this ... the dealer (stealer?) told Brandon to not use synthetic oil in his scoot because of the transmission?
I am going to guess that honestly the dealer he spoke with has zero knowledge of how a CVT scooter works. The transmission in many motorcycles co-mingles the engine oil with the transmission oil and you need to be careful you don't use the incorrect additives in the oil or it can mess up your transmission.
A scooter with a CVT has a belt that runs in air (not oil) so it make no difference to the transmission what oil you run in the motor. THEREFORE...if you want to run synthetic, you may run it anytime you want.
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Also, motorcycle oil is different than car oil because of additives for lubrication of the gearbox.
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You could use Harley-Davidson oil I have ridden H-Ds for ten years and the Motor Company tell you that using anything other than own brand mineral oil can lead to an accident and or death,until they bring out their own very expensive synthetic oil that magically does the job of the three different oils that I had to put in my Dyna Super Glide. Most older riders me included (50yrs riding) will tell you put any decent 20-50w oil in and change it frequently.I pick up my Pulsar LX on Thursday so I dont yet know the recomended intervals.
Hope this helps. Ride safe...
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I did have a problem on a Kawasaki KLR650 caused by oil.I changed oil and instead of using a 10W-40, I went to a 15W-40 diesle oil.The viscocity difference doesn't sound like much does it.But it was cold in the winter time. I found that, after the oil change, when I started the engine cold, it started knocink like crazy. Whatever the actual visocity difference was, the 15W-40 was taking longer to circulate, and caused a knock.Switched back to the 10W-40 and the knock was gone.
jn
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I got some oil left over from my turkey i fried you can have that -----lol :)
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Bird.. with 15W oil, the cold temp oil viscosity was wrong. The first numbers of the rating (10W or 15W ) is the oil's viscosity, resistance to flow, when the oil is cold. As you found, when you have the incorrect rating and it's cold, you will get knocking.
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So right! The difference between the 15W-40 and 10W-40 was amazing. And yet, both my Sportster and my Royal Enfield 500 Bullet (for sale) do just bfine running 20W-50 oil all winter long.
jon
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I am using Mobil Synthetic 10w40 for a while and it works great with my Agility125. Now that the temperatures are in the 20s the engine has a little bit of a hard time though. Think I will be switching to a 5w40 for the winter, especially before temps drop below 20.
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my oil has been breaking down rather quickly...
Below is a link to a page talking about the Kymco scooter manual stating that a SG-rated 15W-40 oil must be used. Turns out, the SG rating for oil is OLD (I think it's now up to SM rating), and the Kymco rep states that a regular 10W-40 automobile oil should be just fine.
http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=1692715 (http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=1692715)
Now that we've established that we CAN use either 10W-40 or 15W-40 oil in our scooter engines, which is the best one? Well, that's a tough thing to figure out.
As for me, because it's a high-revving engine, I want to be sure that there's no foaming, and little viscosity breakdown over the life of the oil.
So, after engine break-in (in which I'll be using a conventional 15W-40 oil and changing the oil and filter very frequently (ie.: after 25 miles, then 50, then 100, then 200, then 400, then 800, then 1600), I'll be using a diesel-rated synthetic 10W-40. Oil and filter change interval after break-in will be every 1000 miles.
The diesel-rated synthetic oils not only have more detergent in them to keep the engine clean, but they've got anti-foaming agents, and stand up to extreme use better, so there's less viscosity breakdown.
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I seriously considered a diesel oil such as the 'Rotella' but have not used but read on other forums many who have used diesel oils w/good results.
I found Valvoline 10w40 motorcycle oil at a good price at my local big box auto parts store. I decided to use motorcycle oil in my PS250 since motorcycle & scooters are similar but not the same, of course. Their motors are similar but most scooters have 'dry clutch' and do not share the same oil with the transmission. Scooters, like motorcycles have small high revving motors that work hard and are hard on the oil.
The Valvoline seems to work good. The motor seems quieter. I used regular conventional 10w40 automotive oil through the break-in w/no ill effects. This Valvoline oil should provide better protection IMO.
I noticed just the other day that Valvoline now has this oil in a synthetic as well. I may try that in the future.
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Anyone ever try any of the Amsoil products? I have a neighbor who is a dealer and he keeps mentioning them to me.
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Best lubricant line on the planet.....They have a specific "SCOOTER OIL"..which has additives that bikes with "WET" clutches cant use...
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I decided to use motorcycle oil in my PS250 since motorcycle & scooters are similar but not the same, of course. Their motors are similar but most scooters have 'dry clutch' and do not share the same oil with the transmission. Scooters, like motorcycles have small high revving motors that work hard and are hard on the oil.
Keep in mind that motorcycle oil won't have the friction modifiers of automobile or diesel oil, because those friction modifiers can make a motorcycle clutch slip. So the motorcycle oil isn't as 'slippery' as other oils, and if you get metal-to-metal contact (piston scuffing, etc.), you won't have as much protection.
So, in my opinion, motorcycle oil would be good for breaking-in the scooter engine, but after it's fully broken-in, I'd use a synthetic diesel oil.
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Maybe not but I figure if motorcycle oil was formulated for motorcycles and motorcycles & scooters are similar except for the transmissions, then why not use motorcycle oil.
Motorcycle oil may not have the same friction modifiers as automotive oil but it has specifically formulated friction modifiers to protect both the motor and transmissions in motorcycles. It is also designed for small high reving motors that shear oil rather quickly so again it is formualted for this.
I poured through countless forums on this and you get difference of opinions on the subject but I came to the conclusion that if its good enough for a motorcycle then it has to be good enough for a scooter.
Not that I am right, just my conclusion and what I am doing!
I do think a synthetic oil would be better but its much more expensive. Given the short oil change intervals on these small scooters it may not be worth it, but each to their own IMO!
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Best lubricant line on the planet.....They have a specific "SCOOTER OIL"..which has additives that bikes with "WET" clutches cant use...
Usually it is vice versa, motorcycle oils have additives for wet clutches that are not necessary in cars/scooters.
I doubt that there is such a thing as "scooter specific additive", regardless of marketing.
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Maybe not but I figure if motorcycle oil was formulated for motorcycles and motorcycles & scooters are similar except for the transmissions, then why not use motorcycle oil.
Motorcycle oil may not have the same friction modifiers as automotive oil but it has specifically formulated friction modifiers to protect both the motor and transmissions in motorcycles. It is also designed for small high reving motors that shear oil rather quickly so again it is formualted for this.
I poured through countless forums on this and you get difference of opinions on the subject but I came to the conclusion that if its good enough for a motorcycle then it has to be good enough for a scooter.
Not that I am right, just my conclusion and what I am doing!
I do think a synthetic oil would be better but its much more expensive. Given the short oil change intervals on these small scooters it may not be worth it, but each to their own IMO!
Friction modifiers are not there to protect your engine, they are added to auto oils to help increase gas mileage. Friction modifiers are not added to motorcycle oils since they may make the clutch slip ( if it has a wet clutch).
Something else to consider. Most scooter engines are very mildly tuned. The specific power output is closer to that of a small car engine than that of a high performance motorcycle engine. Probably any properly rated oil will work fine in your scooter. I plan on using Rotella 5w40 synthetic in my Super 8 on the next oil change. It's a full synthetic and costs about the same or less than motorcycle specific non syntheitic oils.
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Klaviator
I was about ready to try Rotella T6 5w40 but found the Valvoline motorcycle oil and decided to go with it instead. Ive heard many good things about Rotella oil so it should work good. Please give us an update on how it works in your scoot.
So far the difference w/the Valvoline oil is the motor seems quieter than w/auto oil. It could just be the difference in brand of oil or mental on my part! I mean the valve train appears to have less noise. I like that! Less noise to me suggests its doing a better job but that's not scientific, Just my observation.
Ive used auto oil in my bikes in the past w/no ill affects but I'm just am not convinced current auto oil is better than motorcycle oil or HDEOs. We will leave that debate for another time. Never tried the HDEOs but would not be afraid to.
The link for bobistheoilguy.com has more info on oil than you would ever want to know.
Cheers!
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I get my GV250 15W40 oil at Walmart. Rotella T and doesn't say it is for diesels, only gas engines.
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I went to amsoil 10w40. 16,000k no issues
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Change the oil often (most of our scooters don't have oil filters). These scooters require very little oil so it cannot be a cost factor, only a hassle factor. As most scoots are air cooled the oil breaks down more quickly than in an engine that is water cooled. If the scooter is new, run it for at least 1,500 miles, changing the oil twice as often as the manual says during this time. (The piston rings will need to "set"). After this "break in" period start using full synthetic oil. If the spark plug appears to foul (sometimes happens), then switch to a blended synthetic oil. Yes, synthetic oil is by far the best lubricant you can find.
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Thicker oil will slow the scoot down a little. I use amsoil 10w40 and have since 1000 k. I also use amsoil gear lube in my rear gears. Amsoil makes a 15w40 but like everyone says it is diesal oil but its full syn. My scoot calls for 15w40 but when i got it i didnt have a license so i rode alot in the winter 4 below zero. 15w40 would have been way to thick at start up. Im at 17,000 k and have had wanderful performance out of my little scoot until i change to the slider wieght and then my stretched belt showed up. Ive not ever replaced my belt so i got good service from it too. My scoot runs as it did from day one off the show room floor and never burns any oil what so ever. Just my thoughts good luck riding and be safe!