It protects clutches, planetary gears, valves, pumps and seals from damaging sludge and varnish deposits.
Transmissions usually operate under severe service con-ditions.
They are subjected to extensive idling, frequent short trips, cold temperature driving, sustained hot weather driving or trailer towing. When conventional transmission fluid is used, it should be changed every 15,000 to 30,000 miles. Drain intervals may be extended indefinitely when fluid analysis is used.