Has anyone used Be Cool Coolant? They say it is superior to anything out there and is used in diesel trucks such as Kenworth from the factory. I saw it on the Speed Channel and they are claiming it mixes with GM antifreeze without any problems. I know some stuff will make the GM antifreeze clump when added. I'd never heard of it before and I've heard adding Prestone can mess up the GM antifreeze.
http://www.lsxtv.com/forum/cools-new...eeze-1238.html#