Prestone,Dexcool? - Nissan Frontier Forum
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#1 (permalink) Old 01-02-2013, 04:09 PM
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which should i use for my 2k frontier .. i searched btw and dont have a handbook.. TIA
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#2 (permalink) Old 01-02-2013, 04:43 PM
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No dexcool.

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#3 (permalink) Old 01-02-2013, 05:55 PM
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^ Bingo. Dexcool is a crappy red "100K mile" coolant that GM put in a lot of its vehicles. It's terrible stuff and the older variants could only be topped off with more Dexcool. If you put plain old green ethylene-glycol in there it would make a gummy disaster. So that long-winded explanation was summed up as: Use the green stuff.
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#4 (permalink) Old 01-02-2013, 05:57 PM
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Dexcool is completely fine, just dont mix it with anything else. Prestone can mix with almost anything. Prestone is green and dexcool is orange. Unless you are flushing, use what you already have. is offline  
#5 (permalink) Old 01-02-2013, 06:12 PM
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Given the gunk that was in the cooling system of my 2000 Chevy Blazer at 75,000 miles in 2005, I wouldn't recommend Dexcool to anyone.
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#6 (permalink) Old 01-02-2013, 06:26 PM
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Agreed on using Prestone green stuff. And buying 50/50 premix is just plain old stupid, unless there is no water available in your area....
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#7 (permalink) Old 01-02-2013, 07:59 PM
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You people are still hanging on to the old technology (I'm a chemist). The older coolants used silicates and phosphates in the ethylene glycol as lubricant and anti-corrosion additives. These coolants are alkaline and therefore not compatible with aluminum parts.

DexCool is a tradename for ethylene glycol coolant that has potassium 2-ethylhexanoate as its additive (Google DexCool MSDS); this is also called organic acid technology, or OAT. Manufacturers have to pay license fee to call their stuff DexCool or DexCool compatible. I just used Peak coolant in my Yukon which specifies DexCool (GM WANTS your business $$$$) and it clearly states on the container "safe for all vehicles and models" and that it does NOT contain silicates or phosphates. I brought some of the Peak into work, dried off the volatile ethylene glycol and water (50/50 was $1 a gallon at Pep Boys Thanksgiving sale), and the Peak coolant was green, then analyzed the residue by FTIR and then by gas chromatography-mass spectrometry.

Guess what: the additive was essentially ALL potassium 2-ethylhexanoate (soap), just like the DexCool !!! And ethylene glycol is ethylene glycol, no matter whose name is on the container. The Peak MSDS search had only stated "proprietary", others state organic acid technology (remember: don't get scared that is says "acid", soap is neutralized organic acid).

Bottom line: if it clearly states on the container "safe for all vehicles and models", then it's essentially identical technology as those that state DexCool. The color doesn't matter, that's 0.02 cents of dye. I'm not sure the old style phosphate-silicate type is even sold any longer.
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#8 (permalink) Old 01-02-2013, 09:37 PM
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Have had no issues with premixed Prestone in all my vehicles

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2014 Cayenne Red Xterra Pro4X (6spd) - 800km!
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#9 (permalink) Old 01-02-2013, 11:12 PM
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Cusser sounds like he knows his stuff.

However, here is my experience. Dexcool ate/eats away at plastic gaskets. Any GM engine in the late 90s early 2000's had plastic head gaskets seals and dexcool would eat away at those seals and cause coolant leaks into the oil. The head gaskets were all crap made by Delphi. Later aftermarket parts were being built with a metal on the inside and a rubber gasket on the outside for an all in one gasket. This solved the problem. The other problem people were having is that when they mixed the dexcool with the green it was gooing up in the engine.

You personally could not get me to buy pink dexcool. I know that things may have changed with Dexcool but it has such a bad wrap that it should be dropped from the market. There was so bad information about Dexcool and there will be for years that it's better to go with the coolant that was designed for the engine. THAT IS THE GREEN STUFF.

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#10 (permalink) Old 01-03-2013, 10:13 AM
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Originally Posted by Suzokie View Post
Agreed on using Prestone green stuff. And buying 50/50 premix is just plain old stupid, unless there is no water available in your area....
Best to use distilled water at about 1.50 per gallon.
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