Oil Smells Like Gas - Oil In Sprk. Plg#2 - BMW Forum - BimmerWerkz.com

3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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post #1 of 3 (permalink) Old 01-21-2005, 03:54 AM Thread Starter
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Hey guys,

Just changed my oil for the first time on this 318. Smelled like gasoline more than most cars.

Also, there was oil in spark plug # 2.

My CA smog test said I was at the limit for hydrocarbons (HC).

Do you think these could all be connected? I also just swapped out the O2 sensor, hoping that will fix a bit of the problem.

I imagine the smog HC was so high b/c there was so much gas vapor in the oil - but why is it getting in there? 113K on the O2 sensor - so it could have been shot, and making the fuel / air mix too rich, so the fuel has no where to go but the oil.

Thanks for the suggestions as to why the gas smell in the oil.


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post #2 of 3 (permalink) Old 01-21-2005, 07:58 AM
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Oil in the plug hole is just means that you need to change out your valve cover gasket-probably. Dont know anything about the gas smell though.

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post #3 of 3 (permalink) Old 01-21-2005, 08:18 AM
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do a test to check if the fuel injectors are clean and opening and closing properly.
it can happen for a fuel injector that is not sealing properly,so it spayed open letting a lot of gas into it, and then the liquid gas ends up inside the piston and forced trought the piston rings into the oil.. if very unlikely but could happen....

then go for the regular tune up, make sure everything is chagend, filters and fluids...

but i would definitely run a compression test and a leak down test, this way you can have a better idea of what is going on...

o yeah, one more thing. form the valve cover to the intake manifold, there is a hose to suck the air from inside the engine. this hose has a nonreturn check valve, but with time, and oil deposists, it clogs up..,, take a peek on the vacuum hoses and hoses around manifold.,

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