I've taken it to the dealer three times now. Initially, they said it was a decomposed oil pan gasket, so I had them replace it. Weeks later, I brought it in again, as it continued to leak. They weren't able to find the leak, so I drove it back home. A few days later (and not to my surprise), the leak returned, so back I go. They said the leak was from the oil pan gasket, so they replaced it free of charge. Darn thing is still leaking. Any suggestions? It's from an 88 Cutlass Supreme.