Hot Shot's Secret HSSFR332Z FR3 Friction Reducer - 32 fl. oz. Increase fuel economy up to 5% Reduction in oil operating temperature Reduces engine wear up to 43% Restores lost compression Recommended for ALL gas & diesel engines. NOT for use in automatic transmission fluid. Engine oil Power steering &amp; Hydraulic systems Differentials 5 quart (car): use 8 ounces of FR3 15 quarts (truck): use 23 ounces of FR3 45 quarts (semi): use 64 ounces of FR3