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Engine oil in air intake manifold



Hi, I am using a Nissan March (manufactured in yr 2000) which has run 127,000 kms. Recently an engine miss came up in the cold start. My mechanic removed the throttle body and found a lot of carbon built up inside it. He cleaned up the carbon and engine miss was gone... However when he removed the throttle body, I found some engine oil inside the air intake manifold. When I ask it from him he told that it's normal and is nothing to worry about. However, I am curious about the reason how the engine oil flows to air intake and is it a symptom of a much bigger problem... Experts in the forum, pls help me to solve this out... ☺️Thanks in advance....

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Get your PCV checked. It is NOT normal to find oil in the intake side but more often than not it is a simple thing like a clogged up or stuck PCV.  If not it can be due to clogged up oil baffles on the cam cover. Again not a difficult thing to clean and solve.

You can refer to the thread below for more details.



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