Dirty oil sitting in recessed area of LIM......why?? - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat
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1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 01-06-2008, 05:46 PM   #11
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Originally Posted by bill buttermore
Originally Posted by reb
The Prestone formula for Dex-Compatible/yellow mixes with any is not the same. I trust that Prestone tweaked the formula to make is safe.
Just to be clear. Prestone markets an orange colored product called Dex compatible that will NOT mix with any antifreeze, only Dex. They also market a "Mixes with any" coolant that is yellow in color. I have been advocating the use of "mixes with any" no matter who makes it. I do not recommend the orange colored stuff, because I believe it to be Dex. The bottle on the left, below is the Dex compatible and is orange in color. The bottle on the right is the mixes with any that is yellow. In this image the "mixes with any" is already diluted, although Prestone markets this undiluted, too.
I read some bottle labels and they said the same thing.
Ethylene Glycol
Diethylene glycol
Potassium 2-ethylhexanoate

What is the difference if they're the same composition?
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Old 01-06-2008, 07:02 PM   #12
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Potassium 2-Ethyl hexanoate is an ingredient found in Dex-Cool but not listed on Dex-Compatible or yellow mixes with anything. The above example you listed is the formula for Dex-Cool. What brand of coolant did you read these ingredients from?

The only difference I can tell so far between yellow mixes with anything and Dex-Compatible are extra corrosion additives in the Dex-Compatible. To meet the GM spec for Dex-Cool, Prestone blends in these anti-corrosive additives. Thus making the dex-compatible coolant mixeable with original Dex-Cool and other Dex-Compatible coolants. What these additives are, I have no idea. Does it make the product unsafe for gaskets, radiators, water pumps etc.? I haven't had any problems at all, but I maintain my car very well.
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