I used Evans and was very satisfied. I spent the money, not in hopes of lowering the running temperatures, but because of the very high boiling point. I had tried everything I, and a whole lot of other people, could think of and finally came to the conclusion that the final .010" over bore, I'd done, must be the culprit and that if I didn't change out the block, I was destined to have 240*-250* running temps. I thoroughly drained my cooling system and then ran low pressure air (reversed shop vac) through everything for probably a total of 12 hours. I ran a 7# radiator cap, just to keep the bugs out, and never had a drop of overflow, even after throrughly thrashing the engine and running temperatures that pegged my 250* gauge, many times. Well worth the money to me, for what I needed. I did make sure to run a full
synthetic oil and never worried about the temps again.