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My father just drained the oil for his 1989 Yamaha Moto-4 350cc ATV and was curious if it would be safe to replace it with synthetic oil. Any help would be appreciated.
 

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What ever oil you use, make sure it's safe for wet clutch. So it should have a JACO rating. I'm not sure if there are any synthedic oils like that. Don't used any oil not rated for wet clutch.
 
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