Fluid Change Intervals

The normal maintenance schedule for drain an refill is 100,000 miles on 1980-85. On 1986-88 models, normal schedule is 30,000 miles for vehicles under 8600 lbs GVWR OR 24,000 for vehicles over 8600 lbs GVWR. If vehicle is driven in heavy city traffic where outside temperature regularly reaches 900°F or higher, in hilly or mountain terrain, is used for frequent trailer pulling or is used in taxi, police, delivery or other commercial service, maintenance schedule for drain and refill is 15,000 miles for all 1980-85 and 1986-88 under 8600 lbs. GVWR or 12,000 miles for 1986-88 vehicles over 8600 lbs. GVWR.