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The bottom line is that the oil needs to be compatible with a wet clutch, and 15W40 meets that need. SpudRider has 59,000 miles on his China bike, and he uses 15W40 diesel oil. Good enough proof for me.
The manufacturer is largely unimportant. Regardless of who actually made the motor, you're not likely to find a quality manual. Feel free to ask whatever questions you have on this forum, and we'll do our best to answer them.
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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