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Several things possible. If it's white foamy substance, it's caused from moisture in your crankcase.
1. Driving short distances- (engine not getting to full temperature).
2. Thermostat not working properly.
3. Head gasket leaking/cracked head letting moisture get in oil. If it is a thick black tar, it could be from broken down oil from lack of changes.
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∙ 15y ago
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How do you stop the build up of gunk under the oil filler cap?
First be sure that the crankcase ventilation system is in good working order, if it isn't unwanted moisture may be getting into the crankcase. If the PCV system is in good working order and you still get gunk building up under the oil cap you may have the beginnings of a failed head gasket.
1999 Ford Expedition has a thick whitish yellowish gunk on inside of oil cap is that normal?
this is NOT normal! This gunk usually means that you have an excess of water (moisture) in your crank case. You should ck for an internal coolant leak
What is white gunk in oil?
cholesterol.
What does it look like when you have oil in your radiator?
A ugly dark colored gunk around the cap on radiator and on the refill tank. Wipe it with a paper towel and you can tell it is oil. That can mean alot of different things - need to get it checked out.
What does gunk under the oil cap mean on a golf 4motion?
any gunk normally creamy under the oil cap normally is head gasket unless the vehicle hasn't been used for sometime then it could be condensation but that will go after a little while buy a bottle of k seal from the motor factors first before changing head gasket as this is really good stuff and is alot cheaper than a head gasket.
A 2002 dodge ram 1500 that seems to have water in the oil but no loss of power no white smoke drives smothly the oil cap has white gunk on it Its been 2 mos truck shows no signs at all?
If it is a 4.7L it is normal for the oil cap to have slime in it. Other wise check/replace the pcv valve and crankcase filter.
Why is there oil in the expansion bottle?
your head gasket has blown,get a local garage to do a compression test,hope this helps, take the oil filler cap off the engine and check for a brown/greyish gunk, if so then your head gasket is blown.
What is an oil cap?
cap that covers the oil fill hole in engine
What is the definition of an oil filler cap?
An oil filler cap is a metal that covers the hole where the oil is poured.
What is an oil filler cap?
Oil filler cap cover the hole in the engine where engine oil is added
My car won't turn over. It sounds like it will start but it just doesn't catch. There was a lot of gunk on the spark plugs that maybe oil.?
From what I've read here. It might possibly be that your head gasket has blown. I had a load of gunk on my Oil Filler Cap today, Cleaned it of went for a long drive hasn't came back just yet so hoping all is good. But spark plugs being covered in junk dosent sound too good.
Where do you put oil?
Oil is added on top of the valve cover. There is a cap, that usually says oil on it. Remove the cap and the oil can be added here.
