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[omega2018]

ok resorting to mr google, agreed it's not very clear but it does seem to me that GM red antifreeze aka dex-cool is OAT

"The OAT formulas approved by GM, called DexCool, contain 2-EHA and in most cases, sebacate, but there is no specific composition formula, only a performance test. "
"However, GM DexCool, a purely organic acid type, also has orange dye, and this has been a source of service industry confusion. "
http://articles.sae.org/11284/

One of the new types is "organic acid technology," or OAT. It's orange. General Motors pioneered this chemistry starting with 1996 models in the U.S. and using the name Dex-Cool. Ford changed a few models to OAT, then backed away from it. VW, Audi, and Porsche are OAT users, too, but most others have resisted.
http://www.caranddriver.com/columns/top-it-up-with-green-or-orange-which-antifreeze

"Certain cars are built with organic acid technology (OAT) antifreeze (e.g., DEX-COOL"
https://en.wikipedia.org/wiki/Antifreeze#Organic_acid_technology


also oat can be red or orange see
see http://www.eetcorp.com/antifreeze/Coolants_matrix.pdf for the colour codes

[dbug]

I have both GM Longlife Red antifreeze and GM Dexcool antifreeze in my garage (5 lits of each).

The GM red longlife antifreeze contains Ethanediol (basically ethylene alcohol), whereas the GM Dexcool (which is more orange than the standard red longlife) is based on 2-ethylhexanoic acid (2-EHA) and other organic acids and indeed is an OAT (Organic Acid Technology) antifreeze.

Read the tales of woe, and litigation, on the net, re the use of Dexcool in older (more than 10 years old) GM engines.  As I said for an Omega use the standard GM Longlife Red, not an OAT antifreeze!

HTH and clarifies.


Have a read of this http://www.reuters.com/article/gm-settlement-idUSN2735011520080327

[TheBoy]

And to really confuse matters, GM sell all coolant under the tradename Dex-Cool. In much the same way all there hydraulic fluids are Dexron.

So Dex-Cool can be OAT or (non OAT) Red.

[frostbite]

Just to confuse you even more is there is is also a h-oat coolant which is mixed with a silicate

[terry paget]

Thank you gentlemen, most informative. When I changed the head gasket on daughter-in-law's Rover Streetwise January 2015 the handbook demanded that I use only organic acid antifreeze, so I bought some specially from Halfords. It was dyed red. I now know I could have used Dex-Cool, had it been the right variety.

[Broomies Mate]

Thank you gentlemen, most informative. When I changed the head gasket on daughter-in-law's Rover Streetwise January 2015 the handbook demanded that I use only organic acid antifreeze, so I bought some specially from Halfords. It was dyed red. I now know I could have used Dex-Cool, had it been the right variety.

You need to slap you Son!