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Changing oil...4 stroke 10w40?

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Hey guys,

Guy at the local dirtbike place said its 100% okay to use HP4 4-stroke 10w40, for an oil change.

is that true?

the manual says 10w30, but im more worried that it says "4-stroke"

is this an issue or no?

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You may use any motor oil as long as it does not have the words "energy conserving" on the bottle.

If it does, it contains friction modifiers such as molybdenum (moly), and could cause clutch slippage.

Some people even use automatic transmission fluid.

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