Posts Tagged: yellow gunk under oil cap

What is the yellow gunk under your oil cap

The yellow gunk under your oil cap does not automatically mean you have a bad head gasket Let’s get this straight from the get-go; Yellow gunk inside the oil filler cap is NORMAL in winter if you drives are just short distances. By itself, it is NOT a sign of a head gasket failure. If you see yellow gunk in the oil fill cap, check the dipstick Check the oil on dipstick. If it look like the brown or yellow gunk in the oil fill cap, then you can start … Read More