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Which coolant to use for Olds Intrigue with 3.5L engine?

(1999 Oldsmobile Intrigue)
in Kearney, NE on July 03, 2009
The manual for my Oldsmobile Intrigue with 3.5 Liter says I should use DexCool for the engine coolant.

However, there is a controversy surrounding Dex-Cool. GM settled a class action lawsuit involving DexCool with several vehicles including the Olds Intriuge with 3.8L V6. That lawsuit has me leery of using DexCool even though the 3.5L V6 isn't included in the class action lawsuit.

What are GM mechanics recommending? Should DexCool be replaced with something else?
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Popular Answer
I would agree with you in not using Dexcool, GM knew it had caused problems and didn't admit liability for a long time. I would phone your GM dealer and ask them what they currently recommend. I would flush out the cooling system thoroughly with water and use Prestone universal antifreeze or any good name brand antifreeze.
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on May 26, 2010
I own a 2000 Intrigue,It is not a must to use dexcool antifreeze. The regular antifreeze works great and they even make the kind that can mix with dexcool so there is no need to flush the system.
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on August 27, 2016
So you mean it's safe to just add & mix the dex-cool Preston brand without worrying about chemical reaction. Accidentally used a regular brand.
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