[pauldenton]

Originally Posted by bobkoure

You mean Swiftech? I would guess the only issue with the Swiftech product is that it has glycol in it. I think you had mentioned in a post that it was around 1% glycol - which totally changed my thinking on it (IMHO no performance impact at all with such a little bit of the stuff).
Racing Coolant, which I've used for a number of years now
(and in race bikes for much longer than that), seems to work fine. However, it was not formulated for watercooling PCs - but racing engines (duh!). Glycols are forbidden on the track as they are very slippery even in small quantity, and are hard to completely wash off a track - comes back every time there's a rainstorm. All that said, the inside of a racing engine is IMHO quite different from what we're doing. Temps are higher. Micro-boiling is an issue. Nobody cares if tubing stains. Water pumps can sometimes be gear-type, which means that long chain polymers get chopped up (well - eventually - engines likely come out long before that happens). Even without having to deal with freezing temps, I would guess that glycol would be attractive as a boil-over protection - but it's forbidden.

less than that even ...
http://forums.procooling.com/vbb/sho...6&postcount=61