skrapiron -FSO
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The 'correct' answer is, you shouod use an oil formulated specifically for motorcycle use.
The 'long' answer is, certain automotive application oils (specifically those with a cold viscosity of greater than 15w) can be used in a motorcycle. However, since the additive package of the automotive oil is not intended for the temperature extremes produced by an air-cooled engine, you may not be giving your engine all the protection it deserves.
Motorcycle specific oils have very different additve packages from automotive oils. Specifically, the type and concentration of certain detergents as well as very different friction modifiers. Even with the heavier 15w50 grades.
If you want to give your bike the best, use the motorcycle specific synthetic oils. If you want to use the heavier grade 15w50 automotive synthetic, that would still be better than any conventional oil (motorcycle or automotive).
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