What sold me was 1. It never needs to be replaced. 2. It has a super high boiling point so even at high temps you don't get steam hot spots. The down side is it doesn't cool as well as water. I had built an v8 S10 that would boil the water out so I think that it sounded appealing at the time. Maybe it would be OK if your cooling system was overly efficient and you could afford the loss of efficiency. Just thought I would throw my experience out there in case anyone was pondering it.