Keeps rubber and plastic seals in automatic transmissions soft and pliable. Leaks caused by hardened and brittle seals are prevented or eliminated. Cleans internal oil passages to allow proper oil flow while restoring the oils performance. Reduces noise and improves shift performance in automatic transmissions. Extends usable transmission life. Add to transmission through dipstick or pre-mix with ATF fluid before adding. Use one can with 4 - 8 liters (4.23-8.45 U.S. QT) oil volume. Only use with ATF II and ATF III type fluids Mix ATF Additive into the gear oil using the dipstick. 250 ml are sufficient for up to 4 - 8 liters (1.0-2.1 gal.) of oil.