Hello friends of the 4 rings, after I actually assumed that my head gasket is flat, it turned out today that it is the transmission oil cooler. Actually I wanted to have it done in the workshop, but after the guy wants to have 600 € for the cooler alone (at ebay 100 €) I decided to powder my money instead. Now the question of the questions: What should I know before I put on a wrench? How best I clean up there s gear from the oil-water mixture? So if someone can explain to me exactly what I have to do, then I wouldn’t be angry about it. Thank you already in advance! MfG Morph Ha, almost forgotten… It is an Audi 100 C4 Avant Bj.92, 2.8 quattro, automatic