Been using Chemtool for years...and like the well liked SeaFoam product others like on this website, been using it as a gas additive for all my vehicles. Also, when rebuilding a disassembled carb, it works great...but be careful, it is a mighty strong cleaner/degreaser...so DON'T get it on painted surfaces or contact rubber parts, it will do quick work on them too...! And do not use it when rebuilding automatic transmissions or brake parts because it is a petroleum distillate...! :s