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I have just purchased a 2008 B&W 150 with almost no Km on it.  Great Scooter.  Oil has been leaking from the air box and it is coming from the transmission via the vent hose.  The manual says fill up until oil flows from the filler bolt hole and that this is .18 Litres.  That does not seem to me to be correct.  I suspect the transmission case would hold at least twice the recommended amount.  Am I safe to assume that putting in 180 ml is adequate even though is is nowhere near the bolt level?