engine oil smells like gasoline - Mercedes-Benz Forum
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post #1 of 14 (permalink) Old 03-25-2019, 01:21 PM Thread Starter
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engine oil smells like gasoline

hi guys. When I smell my car's engine oil it smells like gasoline, when I open the oil cap while engine running I also get the same smell. I've been seeing milky residue under the oil cap and hose, you said it could be from cold weather and short distance trips but I'm starting to worry. I see a little smoke coming and going inside when I open oil cap. Are there any possibility of gasoline mixing with oil? When I start the car in the mornings everywhere smells gasoline for a few minutes, is it normal?
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post #2 of 14 (permalink) Old 03-25-2019, 06:04 PM
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Definitely not normal.

Is the B running smoothly ?..and pulling normally..? Is the oil at and staying at the correct level..?

If you open the hood at startup, do you see any wetness or smell any gas ?
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post #3 of 14 (permalink) Old 03-25-2019, 09:13 PM Thread Starter
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I changed oil 2 days ago after 2 months in case of possible contamination. The guy who changed oil poured 5.5 liters in it. Now if I pull the dipstick it shows above max line. now I have to remove some oil to track oil level. other than that car runs very smoothly actually. just noisy engine as always. sometimes it makes ticking noise but generally on cold starts. and all the values on odb scanner are fine. there is no wetness or smell under the hood. smell comes from exhaust pipe I'm definitely sure. It is unburned gasoline but it smells for 2 minutes than it stops.
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post #4 of 14 (permalink) Old 03-26-2019, 02:23 AM
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If level is above max, It mixed gasoline and oil. Engin head has to be repaired(maybe gasket is bad). Consult with your mechanic.
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post #5 of 14 (permalink) Old 03-26-2019, 04:30 AM Thread Starter
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If level is above max, It mixed gasoline and oil. Engin head has to be repaired(maybe gasket is bad). Consult with your mechanic.
what is the relation between engine head and gasoline?
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post #6 of 14 (permalink) Old 03-26-2019, 05:53 AM
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If gasket is in bad condition, it could miss the gasoline. It sits between enngine block and cylinder. I’m not so sure about this, but I think that problem is somewhere in engine head.
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post #7 of 14 (permalink) Old 03-26-2019, 06:25 AM
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...........The guy who changed oil poured 5.5 liters in it. Now if I pull the dipstick it shows above max line. ................

Your engine should take 5 litres of oil.(I believe...) It shows over max because too much was installed at that oil change.. 5.5 litres is too much.

Is your coolant also showing the proper level..?
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post #8 of 14 (permalink) Old 03-26-2019, 06:38 AM Thread Starter
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Your engine should take 5 litres of oil.(I believe...) It shows over max because too much was installed at that oil change.. 5.5 litres is too much.



Is your coolant also showing the proper level..?
Today I got 0.7 liters oil drained. It shows a bit below max level now. Coolant level is ok and temperature gauge shows correct value I think. It starts with 40 celcius and fixes at 90 celcius. I've never seen it above 90 celcius. Now I'm planning to measure oil level every week and see if it inceases. I asked a mechanic today about gasoline smell in oil, he said it is ok, gasoline engine oil may smell like gasoline a bit. I don't know, with residue under cap and hose and smelling gasoline makes me think something is not working properly but I don't know where to start.
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post #9 of 14 (permalink) Old 03-26-2019, 11:22 PM
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Mine sometimes has a bit of unburnt petrol smell for a moment or two on startup on a cold morning. Then again so did my previous car a Toyota so I haven’t worried about it as the Benz has better economy than the Toyota.
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post #10 of 14 (permalink) Old 03-27-2019, 10:28 AM
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If you have faulty injectors or regulating valve, the excess fuel will pass by the piston rings and accumalate in the sump with the oil. In essence you are driving with 'engine flush'. The oil will lose it's viscosity and lubricity and you will wear the bearings in the engine. As for the smoke from the oil cap, this blow-by gas. Check PCV/CCV.
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