This sounds good, but if you look on the antifreeze bottle, the more water you put in it, (they have a chart), 50/50 offers less protection than 70/30 (a significant amount less), so I would think pure would give the best protection. mike --- Donald Ekhoff <ekhoff@xxxx> wrote: > David, > > You can run pure Antifreeze but you will give up > cooling performance. Water > has a lower flow viscosity, better heat transfer > characteristics as well > (and most important) better heat capacity. What > this means is that a given > volume will transfer more total heat.