Evans NPG Coolant is inhibited 100% propylene glycol. Evans NPG Coolant can maintain a substantially vapor free liquid to metal contact (nucleate vapor only) at all coolant temperatures and engine loads. Additionally, the small amount of vapor generated during nucleate boiling is easily swept off the metal surface and then completely condensed within the coolant jackets of the cylinder heads thereby never passing on to the radiator.
It is simply another glycol based coolant. Ethylene glycol
Is the coolant used in most engines. There is a lot of hooy to read on that site. It is doubtful indeed that using this stuff would be noticeable to the driver under ANy conditions. To my knowledge all recers use straight water. I do know for sure that NASCAR demands water only.
If those 9500 rpm engines don't overheat for 500 miles I doubt ANY use for this stuff.
I run straight ethylene glycol in my rides with no water added anyway. It will start to freeze (slushy) at 0* F however.
Big JIm <img src="/forums/images/graemlins/pfft.gif" alt="" />