Hello I'm Charlie. My grandfather has a 2001 Cadillac catera it only has 60,000 miles and he took it to a shop and he had bAd valve covers. And it was still leaking so he took it back and the guy said he needed to pull the engine and change the head gaskets. But it runs fine but it's leaking everywhere but there's no sign of a bad gasket no smoke or anything I need help I told him I'd fix it if I could figure it out. Please help!!!! Thanks!!