Quickly and safely cleans harmful sludge and other deposits in the crankcase of All gasoline and Diesel engines without the use of aggressive solvents. Frees sticky valves and lifters for quieter operation, opens restricted oil passages to improve overall oil circulation, removes water for enhanced corrosion resistance, and frees sticky piston rings for reduced oil consumption and blow-by. Compatible with All single-grade and multi-grade conventional and synthetic gasoline and Diesel engine oils. Treats 3-6 Quarts of oil.