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OAT (Organic Acid Technology) long life/extended life coolants were originally orange. Later versions were green or yellow to indicate their semi-compatibility with green EG (ethylene glycol).
There's been a lot of bad press and law suits surrounding GM's DEX-COOL. GM engineers blamed, amongst other things, trapped air pockets left behind after a system flush.
Many OEM car brands now proliferate. Maybe that's nothing more than liquid badge engineering.
I miss the plain old green EG - just had to change it every 2 years. Meantime, I'll bend over for a $25 jug of Porsche antifreeze.
My 97 manual says the coolant is for the life of the engine. Is anybody flushing on a more regular basis?
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