Will using car oil ruin my motorcycle engine?

The main problem is if your motorcycle has a wet clutch which is lubricated by engine oil, as modern low friction oils will probably make it slip.

Motorcycle oils are different and more expensive than car oils, so many riders use car oil in their bikes. I’ve never had any issues using car oil in road bikes, but I would suggest using proper competition motorcycle oil in racing and trackday bikes.

Semi synthetic oils won’t affect the clutch, nor will normal fully synthetic oils.

It’s important to use the correct viscosity, and change regularly it to the manufacturers instructions.

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