Dexcool

[bbdon]

I have been reading a lot about this subject too, since we have an S-10. My understanding about the Dexcool is that the chemical reaction that creates corrosion protection with this coolant is dependent on high temperatures to work. So in a show car that does not get warmed up much, you don't want Dexcool. It won't provide any corrosion protection at all on a trailer queen. I think that some of the sludge problems that people have been having were traced to incompatible stop leak, which may have actually been put in by GM at the factory. The advantage of the Dexcool is that it lasts longer, and reduces water pump wear. I don't think that those are important factors for a valuable low mileage musclecar.

[NCGuy68]

Whether you run ethylene gylcol or Dexcool DON'T mix the two! It will turn to jelly. Saw a example of this a couple weeks back and it wasn't a pretty picture.

On the other hand, my 2000 SS came with Dexcool. Its now over 4 years old and looks/smells as fresh as day one.

[elcamino]

Another thing I found in some GM TSB is that Dexcool is not back-wards compatible. Meaning if the vehicle never came with it, don't use it because it may react to the metals in the engine or the cooling system.

I know I have the TSB somewhere here but cannot find it right now. It listed what cars and truck came filled with it and those that did not and recommended against using it in those that did not.

So it would seem not the coolant to use in a classic car.

[Norm reynolds]

I have to disagree you can do a back wards with dexcool Pontiac had a TBS
On the V6 it seems that GM engineering found that they were replacing way to many head gaskets and it was found that dexcool was the problem I cannot find it right now
I went though five water pumps in five years on my Blaze with a 350 When Iput on the last one I put back the green antifreeze and no more water pump problems
A friend of my had his Blazer in for service at a local Chevy dealer and they told him that his head gaskets were showing signs of leaking they also told him it was because of dexcool we drained it out and flush it out real good and put in the green antifreeze that was nine months ago and so far no leaks When I was working on a fleet of trucks we had a real big problems with the Cuminigs diesels blowing out head gaskets
I was told by Freight liner to dump the dexcool [img]/ubbthreads/images/graemlins/thumbsdown.gif[/img] Like I said before I have seen way
To many problems with it and I WOULD NOT USE IT ON A SHOW CAR [img]/ubbthreads/images/graemlins/no.gif[/img]