94+ = teflon

What year is your boss' Bonnie Bill? Cause if only 94+ has tetlon, why are those rotors looking like my stool samples?

Bill, maybe I can't see it well enough in the pic, but my 92 rotors looked just like that hwen that SC came off. The 94 I put on had rotors coated in a grey substance I believe is teflon. Yours look like EGR soot to me.

Hard to tell in the pic, but mine are Teflon coated. That'* how I found out about teflon in the first place. There were a couple spots on the end of one rotor where it was starting to come off. I'll remember that to the day I die, cuz a buddy of mine asked if that was to lubricate them in case they touched. I told him I certainly HOPED they would never touch!

Mine may have been replaced at some point.

Boss'* car is a 95 Buick Riviera.

I'm sure 94+ got the teflon to provide a better seal and raise the VE. 92-93 = not so lucky. It was a fairly detailed explanation I was reading too, just like maybe a week ago. I'm sure I bookmarked it but I have @$$ loads of engine related links so sometimes its hard to find. I'll check more tomorrow

I just had my 92 apart, and there was no teflon, just a thick thick layer of the blackest meanest carbon crap. It took forever to clean it off. I used everything in the book to get it off. But the carbon probably doesn't hurt anything. It'* just going to come back.

My throttle body was the same way. So much carbon the plate would stick, I could hardly get it open by hand, and it would open with a resounding "snap"! Once cleaned, it is perfect.

BTW I purchased some of the rheo temp 500 for the end bearings, I'd like to recoup some of that expense, anyone need a tiny bit????

Some what for what?

That'* the grease for the needle bearings on the shaft ends of the rotors.