My LTD 2006 Roadster was leaking at the little covers to the valve covers. I bought some high temp RTV, cleaned the surfaces, chased the threads with steel bolts and used the aluminums to close up. Just put on evenly and loosely, let the RTV set up then tighten ( Just snug), to tight and the aluminum bolts will break. No leaks now. There is a thread about oil leaks at the valve covers, that's where I found out about it.