I run 50/50 in the truck and RV, Bombardier calls for 60/40 anti-freeze/water, I can't imangeine that 50/50 would hurt, also on the cool-tech page under winterize it tells you to add anti-freeze untill you get appropirate freeze protection but everyplace else on that page steers you away from using anti-freeze, I can't say for sure what the consequences of using 40 below with anti-freeze are but I'm going with Engine Ice to be safe, with -54 freeze protection I'll be ok here in Denver, just my .02

 

have any of you guys ever used water wetter made by red line?
i use to race dirt track cars i used it alot it works great and its alot cheaper than 40 below. 9.95 a bottle is what i was giving for it. may be what you guys are looking for.

 

Wetter Water was right on the shelf next to 40 below, according to the label when mixed with anti-freeze mix it dosen't lower temps very much over 50/50, when used in low anti-freeze mix's it does better but it offers no freeze up protection. I'm sure these products will work for folks in warmer climates but some of us have to do better