Dexcool

John M · 11-23-2008, 06:29 PM

I know the horror stories of Dexcool and GM, but how does it affect the Duramax? Should I get it out?

bpick24 · 11-23-2008, 07:08 PM

Dexcool is just as good as any other antifreeze, like others it breaks down, so just flush it every 36 to 40k and you should be just fine. I always try to use what is recommended when we are repairing a vehicle at the shop. but I do give the reminder that it may protect for up to 100k but the ph level is what causes the problem. just buy a bottle of ph testers and test it twice a year, then you'll know when it's starting to cause trouble.
Ben

toypuller · 11-23-2008, 07:12 PM

The old design of dexcool we are told was the problem dexcool. Dont worry about it. Its a great synthetic coolant.

**Tow Master** · 11-23-2008, 11:53 PM

I agree that the newer stuff should be fine. Id also consider flushing and replacing it ever 30-40,000 miles.

**usafracer** · 11-24-2008, 01:30 AM

The biggst problem with dex cool people were mixing it when it first came out.

Killerbee · 11-25-2008, 05:59 AM

I would be interested in seeing any evidence of a formulation change. To my knowledge it hasn't changed, but that doesn't mean much. I no longer use it. Its funny that dealers convey it is a synthetic coolant. GM cracks me up sometimes.

mijdirtyjeep · 11-25-2008, 06:11 AM

So Killerbee, what would you suggest using instead of DexcooL? I had a 97 Blazer and it screwed the radiator all up (plugged). I never put anything other than Dexcool in it and it still got all nasty.

Killerbee · 11-25-2008, 06:18 AM

I am not suggesting you do what I do, but I use G-06, an amber colored Hybrid OAT. It restores a lightly silicated formula.

3 drops of red food coloring, and it looks exactly like dexcool

for warranty coveting.

John M · 11-25-2008, 05:15 PM

Let me say this then Ill ask my next question, G06 isnt a diesel coolant, even though Dorf uses it, they are better coolants for diesels. Now, having owned only one diesel before, 7.3 Powerjoke, I know of several coolants on the market for diesels, are there any GM, or Isuzu, (they still build the Dmax right?), recommends NOT using? I plan on changing to the Rotella red. I really like its additive package.

Killerbee · 11-25-2008, 05:23 PM

Correction, G-05. Sorry.