I was wondering if any you had any input or bad experience with Dex-Cool coolent? I have been looking at another automotive forum site dedicated to the GM minivans like Ventures, and Montanas, and came across some interesting info regarding Dex-cool. Appearently these vehicles with the 3400 V6 also have intake manifold failure issues like the H-Bodies. The problem with the 3400 is the gasket material seems to degrade prematurely and this may be accelerated by Dex-cool. Dex-cool seems to have some additives in it that increase it'* life but damages gasket material, and it also seems that GM has swithed to Prestone long life in the newer cars. Here is some info from Prestone.
"Thanks very much for your inquiry. The Prestone Extended Life Antifreeze has recently (2001) been requested by GM to be factory filled in their vehicles. This is our patented formulation that meets GM Dex-Cool requirements and is approved
for use. Our product is not aggressive towards gasket material and is safe to use"
Is this true?
The car owners on that site are pretty steamed with GM and are trying to start a class action lawsuit about the intake failures in their cars. We have a Montana but we have not had any intake problems yet. We are having transmisison problems with it though, and that also seems to be a common problem with these cars.