1999 Chevrolet Silverado 1500 Pickup Owner's Manual - Page 384

yellowblue Scheduled Maintenance -- Gasoline Engines 22,500 Miles (37 500 km) j Check Oil Life Monitor. If engine oil and filter are changed, reset monitor. j j j See "Engine Oil" in the Index. An Emission Control Service. (See footnote *.) Lubricate chassis components (or at each engine oil and filter change). (See footnote #.) Check rear/front axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking. Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation pattern and additional information. (See footnote +.) DATE ACTUAL MILEAGE SERVICED BY: 30,000 Miles (50 000 km) j Check Oil Life Monitor. If engine oil and filter are changed, reset monitor. j j j See "Engine Oil" in the Index. An Emission Control Service. (See footnote *.) Lubricate chassis components (or at each engine oil and filter change). (See footnote #.) If Equipped: Replace passenger compartment air filter. If you drive regularly under dusty conditions, the filter may require replacement more often. Check rear/front axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking. DATE ACTUAL MILEAGE SERVICED BY: 7-8