My FMIC Is having my Water/Oil temps running fairly high on my S5 TII setup. I'm opting to dump the 50/50 ratio of Coolant to Water and the bottle of Waterwetter by using a a ratio of no less that 15% water and 2 16oz bottles of Purple Ice. This should cool things down abit.

Anyone running this stuff? Comparible to Redline?

 

I've since went with the Purple Ice (a couple of hours ago actually). Although It's fairly cool tonight I have noticed a moderate drop In temps. I determained this by Idling with the Hood closed. I can't say for sure If this Is attributed to the Purple Ice though as I'm running 30% less Coolant and double the additive. It's great so far.

 

I've used both but my car is bone stock
for both years I used 70/30 water/coolant mixture and the car feels very similar in terms of "heat on the hand"

both years I went to a high performance driving school in dry, Albertan heat with the same kind of oil...engine performed very similarly

I think they're both good products but I'd go with Purple Ice because you get more per bottle and it's about the same price I believe.