Hi all. New owner of a 2004 Deville. Car is immaculate inside and out. Bad news is after checking out this site I found that I am cruising for a bruising because of the head gasket stuff I see on here. The guy told me he used Blue Devil, but when he told me I had no idea what it was and why he used it. Could I get a motor out of a 2007 DTS and it would work? Would it be cheaper to take my current motor to like Thunderbolt or something like that and have them fix whatever is wrong? I'm in Houston so if anybody knows any good shops here that can get me squared away I'd really appreciate it. I have read something about bolts on here, but it's all Greek to me. Thanks in advance fellas.