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Is Dexcool really required?

Discussion in 'Chevy Truck Talk & GM News' started by missionwolf, Jul 9, 2013.

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  1. missionwolf

    missionwolf New Member


    I added a small amount of green antifreeze to my organization's Chevy 1500. I later noticed a sticker that stated to add only Dexcool antifreeze and that anything else could shorten the the required time between coolant changes. So, I have a few questions: 1) Will non Dexcool coolant really shorten the required time as stated or is this a product markup? 2) If it is bad to have added a different kind of antifreeze, is it as simple as just shortening the life of the coolant in the system or can the results be more dire (i.e. corrosion to the engine or radiator)? and 3) If you recommend flushing the system and putting straight Dexcool back in, can I use the flushed Dexcool/green mixture safely in other vehicles that take regular antifreeze? To clarify, I added perhaps a half gallon or less of the green into our Chevy's system. Thanks for your help,

  2. stchman

    stchman New Member 1000 Posts 100 Posts

    Don't do it!!!

    My buddy owns a repair shop and says that Dexcool mixed with green antifreeze can cause a brown sludge to form in your radiator. This is the whole reason that Dexcool is colored and orange/red and regular antifreeze is colored green.
  3. JTWard

    JTWard Member 100 Posts

    I don't know what year your truck is, but you should go and have the system flushed and refill with DexCool. DexCool is a required coolant in most all GM vehicles after 1995, if I'm not wrong. But DexCool chemistry behind DexCool is such that it will not harm the environment if there is an accident or leakage. The formula is such that if it is exposed to air, it neutralize itself. With ethylene Glycol or Green coolant, if spilled it is poison to any and all animals who might ingest it. The internet is full of horror stories of and about DexCool, but the problems with vehicles that had problems were due to an idiots design of head and intake manifold gaskets, not the coolant. But once more, The Green coolant will cause a problem with the DexCool as the two are totally different chemicals. You made a simple mistake, protect your engine and go ahead and have it flushed out and refill with DexCool, FWIW, DexCool has a useful life of 5 years, I am going to have my other car which came from Bowling Green with DexCool and I change it every 5 years like clockwork.:great:
  4. McClintoc

    McClintoc Super Moderator Staff Member Platinum Contributor 1000 Posts 100 Posts

    Like stchman said, DO NOT mix Dexcool with other antifreezes!!

    I had a buddy do that to his Silverado and it corroded through his radiator. Dexcool only!! If you want to change to non-Dexcool antifreeze, you'll have to do a complete/thorough flush.
  5. truc.karl

    truc.karl New Member

    I heard that mixing Dexcool with green antifreeze can form a gel-like substance that stops coolant to flow which can lead to engine overheating.
  6. Conlan Rose

    Conlan Rose Super Moderator 1000 Posts 100 Posts

    It states on every bottle of Dex-cool that if it is mixed with green antifreeze it dramatically shortens the life of the coolant. Also in some cases cheap green coolant can turn Dex cool into acid that can damage the radiator and engine.

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