Pour contents into transmission with motor running at idle speed and transmission in park. Will treat all automatic transmissions up to ten (10) quarts of ATF. On large transmissions that require over (10) quarts use 1 ounce per quart of ATF. For Allison Transmissions use 1 ounce per 2 quarts of ATF. 4 X 4 Transfer Cases use 1 ounce per quart. Be sure to check your owner's manual or dipstick for the correct type and amount of transmission fluid. Do Not Overfill. Call for Technical Assistance.