Originally Posted By: ls1mike
Why would you change it on an LSX motor and run the risk of combining the two and guming it up?
Everyone here is like "Oh no Dex Cool the sky is falling"
If you own a 3.1, 3.4, 4.3 or 3800. I might be a bit concerned as it has caused problems in those engines.
But an LSX motor which is a 4.8 Dex cool has not caused any problems.
Check out LS1tech.com, LSXnation.net, or fullsizechevy.com. That it is where all the Dex cool experience is in regards to the 4.8, 5.3, 6.0, 5.7, 6.2.(Corvette, Camaro, Firbird, Silverado, Sierra, Grand Prix GXP etc etc)
You have no fluid in your intake and everything but your block is Aluminum.
Your truck your money, but Dexcool is all I have run in my LSX based motors and is what most folks run in theirs. My 04 5.3 went 120,000 miles on the original Dex cool before I changed it out looked as good as new.
I'm not sure why it would gum things up. Even without a flush, I wouldn't expect it to gum up - but I'm doing one anyway with distilled water.
My parents have a van with Dexcool that has 100k on it and Dexcool looks great! Then they had to replace their water pump and intake gaskets for $1200. I'm too thrilled about the stuff, personally.