There's nothing inherently wrong with mixing silicate and a pure OAT coolant like Dexcool, in fact most European cars come with silicated OAT (Si-OAT) coolants from the factory. In 1997 common GM engines like the gen 1 SBC V8, the Buick 3800 V6, the 60 degree V6, the GM122/Vortec 2200, the Quad Four, etc where all iron or iron block with aluminum heads, and all aluminum engines where rare birds like the Corvette only gen 2 LT5 V8. When GM introduced Dexcool in 1997 their entire engine lineup was almost entirely all iron block and heads, so to say it was developed for aluminum block and head engines is flat wrong. Dexcool was among the first OAT coolant formulas used by a OEM, and the Organic Acid Technology means it has additives that are carbon based (unlike silicate and phosphate) which handle corrosion protection.
Simple.ĭexcool not having silicates = it does not offer corrosion protection of internals is a 100 % wrong statement. No exceptions.įlush it however you want, refill it with Ford Green stuff a 50% mixture, and change it every two years or so. That means a two year service life forever after that. Once silicates (green stuff) is introduced into any engine, even those designed for dexcool, you can't get rid of them. It was designed for aluminum heads and block, hence the OAT additive package on top of the glycol.ĭexcool, not having silicates, will offer longer life water pump seals, among other benefits such as 5 year life. If I do a complete flush of the system from the block, radiator, and water pump and refill with distilled and Ford green, will I be able to mitigate the damage?ĭexcool does not have silicates, so it does not prevent corrosion of internals. Would it be any different if he flushed the system at the radiator before adding the dex cool rather than just topping off with green? I doubt if he flushed he flushed at the block I'll ask after I callģ. How much/what kind of damage can 8 months of dex-cool mixed with green do to the system? I didn't see any coolant leaks anywhere and it doesn't look like there was any K-Seal or any sort of leak stop used.Ģ.
#DEX COOL COOLANT ISSUES FULL#
There's a lemon law in Massachusetts where I'm buying it so if it's a massive problem I can return it to him for a full refund.ġ. I haven't called him back yet and I have a few questions before I call him back. I left to go look at another truck and the first guy sent me a picture of the other stuff he's giving me with the truck and in the picture there's a bottle of Prestone Dex Cool so I'm almost positive he's the one that added it. I took it for a 10 minute drive and it got up to temp and didn't start to overheat at all so it doesn't seem like it's having the typical overheating issues. He's owned the car for 8 months and put a few thousand miles on it.
Everything looked great on the engine, it has a minor oil leak somewhere (looks like the valve cover?) When I opened the radiator cap I noticed some gunk on it and it had an orange/reddish color which was odd because I was pretty pretty sure Ford uses green or yellow. I'm looking for a Ford Ranger and I found a 2000 with low miles and very little rust (near impossible to find for this age in New England).
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