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Oil Smells Like Fuel

jjpea

By jjpea,
in General Maintenance

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jjpea Rookie

jjpea

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:rolleyes: I was cleaning my engine bay yesterday and when I took off my oil fill cap to clean around it, I could smell fuel. I stuck my nose down and yes, the fuel smell was so strong I couldn't smell the oil. Many years of motoring and I have never run into this. Is it normal for a twin turbo? What would cause this? I'm getting good gas mileage. The engine runs strong, oil pressure is good. Any ideas?
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Godzilla32 Veteran

Godzilla32

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Most likely due to blow by gasses. Combustion gases leak past the rings and get into the sump. Thats the whole reason for having positive crankcase ventilation (PCV). To remove those gases from the sump. If they build up too much is can become dangerous. Check that your PCV valve, located on the inlet manifold balance tube, isnt blocked, with the engine off shake the valve to make sure it rattles, this indicates its not jammed. Also check it has a strong vacuum there when the engine is running.

PS: The only time people use mineral oil in import engines is to run them in. Synthetic oil isnt made from crude oil.

Deren

Edited by Godzilla32
  • 3 weeks later...

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