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Originally Posted by mountainman
Is it necessary to use porsche-VW-audi antifreeze or are the american brands also ok to mix in? I am sure the porsche dealer would say only porsche, but he of course has a vested interest
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lots of answers to this. pedro sums it up thusly:
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Originally Posted by pedrosgarage.com
I chose not to go with the Porsche coolant.
If you do the same, be sure to get phosphate, silicate and nitrite free product such as Prestone.
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Originally Posted by mike focke's boxster page
Porsche claims their coolant is Lifetime, but don't believe it. It is simply a silicate and phosphate free Glycol based coolant. This should be changed every 5 years/150k mi. (whichever comes 1st) in order to provide maximum corrosion protection. It is the organic carboxylates which breakdown after this interval.
Instead of buying the super-expensive Porsche Coolant from the dealer, Zerex Extreme Life 5/150, Texaco Extended Life, Shell Rotella® ELC Extended Life Coolant, UNI-GARD 5/150, Mercury Extended Life Coolant Anti-Freeze, all meet or exceed Porsche Coolant requirements and are much cheaper. Use of any other type coolant is not compatible with the system and can form a gel-like substance if mixed with the proper coolant which can then obstruct flow, create hotspots, blow up your engine, etc.
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in general the two sides are: as long as it's phosphate and silicate-free coolant it will be fine. the other side tends to argue "for the few extra $$, why risk it?"
either way you go, i would not mix. if you do go with non-porsche, flush first. if you're just low, add some distilled water.