Cooling System Additive

before you try any snake oils, try a tablespoon of Calgon. No kidding. Its a surficant (sp?) as is water wetter, that reduces the surface tension, ie. it gets 'closer' to the cylinder bores and doesnt foam up. Plus its probably free from under your sink. give it a try, only harm will be a cleaner water jacket when you flush it. only thing Prestone does is reduce freezing temp, increase boiling temp, prevent rust and lubricate water pump...did I say only? Old skool is distilled water and Mopar rust inhibitor.