Service Intervals

NOTE: Trucks and Vans are identified by 2 different emissions control standard classifications: Light Duty and Heavy Duty. Light Duty refers to vehicles up to 8500lbs. GVW; Heavy Duty refers to vehicles over 8500 lbs. GVW.

Check fluid level at 12 month/7500 mile intervals (6000 miles on heavy duty vehicles). Periodic draining and refilling of transmission is not required, with the following exceptions:

On vehicles equipped with 5-speed manual transaxle, drain and refill transaxle at 30,000 mile intervals.
On all "S" Series trucks with 4-speed transmission, change transmission fluid after the first 7500 miles and at 35,000 mile intervals thereafter.