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there is a positive crankcase vent PCV that allows the case to breath. this line usually goes up to the air cleaner, the oil vapor reenters the engine through the intake, this is part of the emissions system. if there is only a little oil in the cleaner, its not a big deal. if there is a lot, you might have some engine problems, maybe blown piston rings.

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Q: What would cause oil in air filter 2002 Toyota tacoma?
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