When I first got my TTA 3 years ago , it had 15,480 , and knew it had a oil leak banking on it being the rear main seal.When I got the car ,put it up on the lift to do the rear main(bought the rubber fel-pro and the Kirban cork gasket).Once I started the task ,upon inspecting closely I could see the rear main has been done and is clean as a whistle behind the cap.
The culprit was some fool used a rubber oil pan gasket and crushed the death out of it.I opted to just do the pan gasket fearing I'd might make the rear main worse if not done right(I have done them before).
New gasket on lightly snugged 1/4 ratchet , off for a warm up test drive , then back on the lift to gently snug the bolts again.
Let me say , this is probably the most leak free Turbo Buick V6 I have ever seen !!!! Even now at 16,300 miles , after drive and parking it ,it is the smallst of a drip left by the rear main , and I mean maybe just a drip.The trans is 100 % leak free as well.I couldn't be happier with this TTA in the "leak" department !!!
My 82k mile GN , I did the rear main at 49k with neopreme ,needs to be done again,leaking pretty good,.....and my 1,400 GN even leaks some .Will not touch that one thought as I don't drive it.
Whoever did the rear main on my TTA ,did a hell of a job !!!!