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What can cuase oil resudue in oil besides a blown head gasket? I took off the radiator cap and there is a small amount of black oil residue. This car has an aftermarket HKS head gasket on it for several years now. Can a leaky valve cover do it? Any info appreciated. Shes headed for a decent mechanic tomorrow. BTW it does not heat up after driving fast, dosn't apear to loose water from radiator and I havent noticed overflow on rad. over flow bottle. I have noticed a water running sound from under dash. Anyone out there with a similar experience? Thanks. Dan