I've never had a water pump, thermostat, or heater core go bad in years and years. I drain, flush, and refill the coolant every 30 k miles. In my '69 Camaro, I use the good old Green Ethylene Glycol based coolant, mixed 50/50 with distilled water. Like an old, old car from the 50's, 40's, or 30's. I would not use the DexCool in a car with brass radiator, or brass freeze plugs, or brass heater core. You just don't want the level to get low. The brown and black sludge formed that many associate with mixing dexcool and other. I don't see why you couldn't use the DexCool in a pro-touring car ( musclecar era car ).with a modern engine, new heater core, and an overflow tank. Dexcool is problematic if mixed with other coolants. When the DexCool level got low, and churned with air, it would gel.Īnd the public blamed the DexCool, when it was actually defective gaskets. It is also known as ethylene glycol and is a clear, odorless liquid. ( This was faulty gaskets, not the Dexcool's fault ) By Chad Christiansen Blog Dexcool is a coolant used in many GM vehicles. In the late '90s and early 2000's we saw quite a few vehicles with leaking intake gaskets. I work at a Chevy Dealer, and we haven't seen problems with DexCool equipped vehicles in years. I have never had a problem with "goop" or gel in the cooling system. I drain, flush, and refill the cooling system every 30,000 miles. My 1999 S10 uses DexCool, but it does not have a pressurized overflow tank. VW\'s G-12 In the end of this thread I posed a question maybe better suited for this thread, any difference between the 2, both are orange and used in Diesel engines. Weird thing is that we did in fact go this far in depth about coolants when going to school lol. The residue it leaves behind is very sticky, and likes to find areas in the engine and other. You can in fact mix them and it has no discernible effect other than lowering the service life to the normal 3/30k. Unfortunately, the dex-cool is capable a rather nasty breakdown. The ideal coolant for most classic engines would be a Ethylene Glycol based HOAT with Tolytriazole, Sodium Silicate, and Sodium Borate.Īnother common misconception is that you cant mix "green" propylene glycol coolants and DexCool. The better stuff is the HOAT (Hybrid Organic Additive Technology) like Zerex G05. I do not know the time frame on when the switch will happen though. From what I am being told it might be dyed orange, like current dex-cool or they may go to another color. DexCool is known as a OAT (Organic Acid Technology) and the main advantage of it is its extended service life. GM will no longer be using Dexcool as factory fill. Little known fact, but the "goop" that DexCool turns into is different for ever single engine, even very similar engines. GM introduced the new pressurized overflow systems with the new caps the same time as DexCool and they're the real cause of all these issues. The video goes into plenty of detail on DexCool, and talks about some of the issues the coolant was connected to, specifically in the area of gasket failures. CamaroAJ is correct, it isnt the DexCool itself that causes the issues its letting air into the system.
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