Here's a tidbit that a lot of folks aren't aware of. I like to pass it along to guys who have A6 compressors in their cars. There is a double lip neoprene shaft seal available that will backfit to the A6 compressor. It solves the problem of the old type ceramic/carbon seal seeping oil and getting it all over your hood, inner fender, etc. It's also more reliable than the mechanical seal for refrigerant retention. The part numbers are ACDelco# 15-30948 or, GM# 2724954 The seal is actually for newer HR6 and V5 compressors, but works great in the A6. Tom Go to autoacforum.com and do a search for .a thread titled "GM A-6 Compressors, Rebuilt?" There is an illustration that shows a cutaway of the A6 seal area and tells where to install the seal. It actually fits into the area where the seal "seat" used to sit. You remove all of the old seal components, install the oring into the seal bore, install the seal, then install the snap ring. You'll only use those 3 parts from the new seal kit.