I don't need marketing propaganda to make my decisions, thanks. This topic has already been discussed, if not here then on HybridZ, MSDS and all. A properly maintained cooling system will not corrode. I've examined enough L-series blocks and heads (among others) to see the effects of neglecting your cooling system, as well as maintaining it. Believe me, I know very well that theoretical stuff is fun to talk about but it helps to have a glimpse of reality when doing so. Anyway, I don't want to derail this thread any further. There are some good points made in this thread (post #21 shares my sentiments, among others): http://www.ffcars.com/forums/17-factory-five-roadsters/302124-you-using-evans-waterless-coolant.html