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Oil in engine air filter?

Driggs

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Has anyone had oil show up in their engine air filter? Any opinions on what can cause that? I noticed some in mine. No issues other than that. I change the oil and oil filter every 5,000 miles.
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mwilk012

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Oil gets in the intake through the crankcase vent and that is normal, but it should be practically impossible for it to creep all the way back to the air filter. You sure it’s oil?
 

mwilk012

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How much is a lot? Also, how could you tell? You have to pull quite a bit to get to the manifold.
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