Quote Originally Posted by RareGMFan View Post
The biggest reason why Dexcool fails is due to user error. The service interval clearly states 150000 miles....OR 5 MONTHS, which ever comes first. Most people ignore or don't notice the 5 months part. That would mean every single Gen II w-body should have had the coolant/antifreeze drained and refilled AT LEAST twice by now, if not 3 times. How many of you have even done it ONCE? The problem with Dexcool is if it's not changed on time, it becomes acidic a lot faster than the "normal" green coolant, thus why all these gasket failures take place. Yes, it was the Dexcool eating away at them, but there's a pretty good chance it wouldn't have happened if the coolant was changed on time.

Also, you absolutely can not mix the "normal" green coolant with the Dexcool, and I'm sure there are a lot of people out there that go to top off with the green coolant because they don't realize their car came with "the orange stuff", or don't care because the green stuff is cheaper/"it's all the same". When the 2 mix, the chemical reaction causes the coolant to gel up and clog the passages, pretty much like what your pictures show. It would not surprise me at all if that was mixed at some point.

I'm not saying it's "good stuff". I still think they should have left the "normal" coolant alone. In fact, I still suggest that people doing a LIM gasket completely and thoroughly flush out their cooling system and switch to the green stuff. I'm just saying a lot of the failures are due more so to people not following directions than "Dexcool sucks".
I agree with everything said except its 5 years not 5 months lol