^ What Bill said. Alot of people say it "destroys" the gaskets, but one of the biggest failures of the 3800s is the original GM Lower Intake Manifold gaskets, they were a "plastic" style and over time would wear out and cause internal leaks and lead to major problems. Felpro and GM now have replacements that are aluminum with rubber seal gaskets. If your's hasn't been replaced with the higher miles you may consider it in the future. But as to coolant, most people recommend changing to the green coolant because it "doesn't cause the gaskets to wear out" but if you maintain the coolant and engine properly you won't have any problems. I know, I still run the orange in mine. Its just about maintenance.
http://www.grandprixforums.net/video...utes-3112.html
Here is a shot of my original gaskets at 75k when I did them, they are worn pretty badly but I have seen ALOT worse.
Originally Posted by AmericanSoldier
easy fix though. But wow! that recovery tank is so nasty you can't see through it 
. I have it soaking in a strong solution of TSP right now.
