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I checked mine at 5000km and they were dead on which is a good sign.  I probably won't check them again for quite some time unless there is a problem.  Feel free to have a look see on yours though, its pretty easy.

Pretty cool, thanks for the link.

I have always had good luck with the Shell rotella synthetic 5W-40.  Good reviews and good price.  Any of the ones you mentioned will be fine just make sure you keep up with the change intervals.

I recently purchased an Agility 125 and I am very pleased with it so far.  I commute on it 17 miles each way every day and so far I have not had any issues with it (approx 2,000 miles) other than a noisy front brake.  That was solved with the $0.98 purchase of brake pad lube from Autozone and about ten minutes of my time.  I can hit 60 mph on the open road and chug up some pretty nice hills at 45 mph (I'm about 160 lbs depending on how many beers and chicken wings I had the night before).  It doesn't have the fit and finish of some of the higher priced models and I believe it is made in Kymcos mainlaind China facility as opposed to the Taiwan factories, thus the cheaper price.  I believe it is a helathy mix of a cheaper scoot with the added comfort of purcahsing it from a dealer with a 2 year warranty (1 year fender to fender then 1 year electrical) for piece of mind.  As far as bare bones transportation I would recommend it. 

Anybody know what size belt the Agility 125s take?  I want to order a spare to have on hand and I'm too lazy to take the cover off just to look.  Are there any good resources on the net for finding this type of parts info since the owners manual is a little sparse when it comes to details.