Doug,

I have been using my method with the Sierra antifreeze (1 part antifreeze to 2 parts water) for 5 years. Finally replaced my water pump impellor this summer. The antifreeze didn't hurt it at all. My Volvo has an external raw water pump. And maybe it's cuz the Sierra is non-toxic?

Quick & easy is best in my book.
_________________________
www.psasnoking.com