Quote:
Originally Posted by cabinetmaker
Not all motorcycle oils are made for wet clutch bikes. Harley oils come to mind. Motorcycle oils are developed for severe service and I would never run them in a car or truck but in a air cooled generator would be fine. I probably shouldn’t have mentioned this because I have raced bikes for years and built high powered motorcycle engines and believe me I know motorcycle oils. They are some of the best oils out there. I guess I should have left that out of the conversation to limit confusion. That wasn’t what this was about.
Here are the facts. Onan does not recommend synthetic oil! Onan does recommend diesel oils for the air cooled gasoline engine generators. 15w40 oils are diesel rated oils. Just trying to help here!
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Interesting all the Harley's I've owned had wet clutches sportster, softail my Yamaha Griz has a wet clutch, my aprilia and one Ducati has a wet clutch, my Ducati MH900e has a dry clutch... even my suzuki 4 wheeler has a wet clutch... They also make a synthetic oil that is compatible with wet clutches... Amzoil, royal purple , Mobil1, etc... My point is they have different specs than car oil they have additives that keep the wet clutches from being to slippery... the additives are different... not saying it is good or bad just different and that they need to meet the specification of the motor... or be better than that... But motorcycle oils are no better or worse than car oil... but motorcycle oil doesn't meet the specifications of any new car oil requirements...
at the end of the day just make sure your oil meets or exceeds the specs for the type of motor you are putting it in...