Duramax Diesels Forum Truck of the Week
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Old 01-31-2009, 05:03 PM
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Default Swap out Dexcool

I hate Dexcool due to all the clogged heater cores my last few GM vehicles have had even with regular replacement of the stuff.

So anyway is it Safe to switch to the green in my Dmax? Any of you guys done it?

Thanks.
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Old 01-31-2009, 05:48 PM
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Yes you can switch over Tim. However, if you decide to switch over just make sure you flush and flush and flush some more because if you do not, you can create hotspots.
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Old 01-31-2009, 09:56 PM
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I was wondering the same thing. A friend of my Dad's has his own shop now and was a GM truck tech, he told me to get the orange Dexcool out of there and put in the green. He said he has seen it eat seals and gaskets away.

Anybody else heard of this?
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Old 02-01-2009, 03:36 AM
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dexacool is oil based coolant.. will not eat gaskets...

green stuff is water based..

green stuff breaks down quicker then the dexacool.

you get coolant (green) in the oil it will turn it to a milky white dexxacool wont.


i currently am running green coolant in my truck
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Old 02-01-2009, 05:18 AM
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dexcool and almost all alternatives, are 96% diethylene glycol. The only differences are in the additive packages, and this leads to compatabilty issues.

Old green is considered very abrasive, and highly precipitive (sandy substance forming over time, especially with poor water quality) with it's high silicated formula. It also has superior anti-cavitation properties.

I use a hybrid low silicated formula, Zerex G-05. A few drops of red food coloring and it looks like Dex.
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Old 02-01-2009, 07:46 AM
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Cool, I am one to change all fluids regularly and i change my coolant every 2 years or less.

Im just trying to prevent the problems assciated with dexcool, The stuff is crap IMO.

thanks for the info.
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2007 CCSB 4x4 Duramax LT3 LBZ

M A STG III Allison- S.C. T-Case brace/Pump rub Fix
Precision Industries M L Race Converter
EFI LIVE V2 DSP5 ACID Tune by DIESEL ADDICTION
Twin Lift Pumps/ Race Valve
6'' T.C. Strong kit/Cognito Braces/SD sleeves.
some other goodies.

2000 ECSB Z71 -6.0 LQ4 BLOWN -TVS 1900 10 psi - Comp 226*-224*/ Dyno Tuned By TJ @ Baker Engineering/SS LT Headers/ RPM LVL VI 4L70E Billet output/ Precision 2600 Vigilante Stall. Hauls Ass
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Old 02-01-2009, 08:42 AM
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I was thinking about doing this aswell. Just to be clear there are no seal compatability problems and cooling system will perform as it does now??
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Old 02-01-2009, 08:56 AM
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Quote:
Originally Posted by TIM Z View Post
Cool, I am one to change all fluids regularly and i change my coolant every 2 years or less.

Im just trying to prevent the problems assciated with dexcool, The stuff is crap IMO.

thanks for the info.
only thing nice about it is the bitter guard in it.... amn get the shit on your lips and it stays there for a few hours
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Old 02-01-2009, 09:05 AM
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my dealer said its perfectly fine, just make sure you get all of the dexcool out. and you have to change the green stuff more often.
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Old 02-01-2009, 12:05 PM
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Quote:
Originally Posted by malibu795 View Post
you get coolant (green) in the oil it will turn it to a milky white dexxacool wont.
yes it will bu. You dont run straight coolant in your truck do you? You mix it with water, regardless if you run "dexxacool" or green. When water mixes with oil it makes white froth.

its "dexcool" BTW


all the dexcool stuff is wives tails from a friends brothers uncles mothers who had a problem with intake manifold gaskets on her 96 Tahoe with a 350.

And its got a bad name because idiots mix it with green and then say WTF DEXCOOL SUCKS IT TURNS TO SLUDGE.

I have never heard of dex-cool causing any problems with duramax's or anything. My engine has been out of my truck probably more times than 98% of you guys here and guess what, dex-cool has gone back into it every time ive refilled it.

just my opinion

ben
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Last edited by duratothemax; 02-01-2009 at 12:10 PM.
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Old 02-01-2009, 02:09 PM
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I have a 04' dmax and have never had a problem with Dexcool. I have 215k miles and run a A5K and nitrous. However, i did crack a trans cooler in the radiator recently and the Dexcool went into my Trans and ruined it. When i drained my trans it was real real milky. This just happend a couple weeks ago, i already got a new radiator and trans in it and put Dexcool back in.
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Old 02-01-2009, 04:39 PM
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Dude that is some crappy luck.
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Old 02-01-2009, 07:39 PM
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Quote:
Originally Posted by duratothemax View Post
yes it will bu. You dont run straight coolant in your truck do you? You mix it with water, regardless if you run "dexxacool" or green. When water mixes with oil it makes white froth.
BS!
i was running OEM form the factory. the coolant system had never been opened up or added to since i bought the truck when i lost my INJ and subsequently the block then crank.

the repair sheet i got form GM dealer was straight dexcool no water. and i was still makeing oil.. go read my thread on DP... it didnt start turning milky white till i got tired of spendign 15.00+ a gallon for dexcool and started dumping distilled water in the coolant

dexcool is and petrolium based coolant NOT a water based
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Old 02-01-2009, 07:45 PM
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oil and dexcool

oil and water/green coolant


see the difference.
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Old 02-01-2009, 09:01 PM
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Quote:
Originally Posted by malibu795 View Post
the repair sheet i got form GM dealer was straight dexcool no water.
why?? Thats stupid and a huge waste of money. A 50/50 mix will net you freeze protection down to -34* and boil over protection to like 270*

Quote:
Originally Posted by malibu795 View Post
dexcool is and petrolium based coolant NOT a water based
when did I say otherwise. Yes, if you mix straight dexcool and oil it doesnt turn milky. But I dont know who runs just straight dexcool....

ben
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