Cummins ISX

“Tell ya what! After using the Flushing Oil Concentrate the way you recommended, the engine oil is still as clean as new after about 600 miles! I’ve noticed too that the engine seems to be smoother and up on power – probably the FTC Decarbonizer doing it’s thing! (2012 Cummins ISX). I’ll keep in touch.”

Marvin M, Lewistown, IL