What Coolant to use for 987

[MNBoxster]

Porsche did recently start selling a Green colored Coolant.

But, even though Porsche touts it's coolant as LifeLong. This really isn't so. The Porsche coolant differs from Regular Ethylene Glycol Coolant in that it does not use Phosphates as the Anti-Corrosion Agent. These Phosphates can form Phosphoric Acid which will attack your Aluminum Cooling System Components.

Instead, it uses Nitrates as the Anti-Corrosion Agent, similar to Sierra, Prestone 5/150 and several others. This is significant because the coolant lasts longer, about 5 years or 150k mi. For optimal Cooling System health, this is the change interval you should use.

If you mix the two types of Coolant containing both Phosphates and Nitrates, these will react and form the Gel you are referring to. So long as you stick with Coolant containing only Nitrates, Gel Formation will not occur.

Also, Porsche isn't in the Coolant Manufacturing business. They buy a ready-made Coolant from one of the few Coolant Manufacturers and sell it (at a BIG Premium) under their proprietary label. If your car is out of warranty, it doesn't pay to buy Porsche Coolant, instead, buy one of the other brands listed and use the 5yr./150k mi. change interval.

Happy Motoring!...Jim'99