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In the end the best way to know is to check the stuff on the back of the bottle....fully synth is best but good mineral wont kill it either, 10w-40 works best in most parts of the world, anything less than 5w-40 are reserved for cars or racing motorcycles and could cause slippage and anything higher than 20w and 50 is reserved for air-cooled harley's modified to run on the surface of the sun :p
First thing to look for is the "JASO-MA" sticker....it means that japanese motorcycle manufacturers have tested it and certified it for use in four stroke motorcycles with wet clutches there now also exists JASO MA2.
If its a car oil youre looking at and cant find a dedicated motorcycle oil its not the end of the world....look that its rated API-SE SG or SG theyre the ratings given to oils that don't have the additives that make clutches slip....API-SH or higher rated oils which arnt specifically designed for wet clutches or dont have a jaso-ma sticker risk including those additives that make our clutches slip.
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