1998 GMC Sonoma Owner's Manual - Page 330

Short TripKity Maintenance Schedule The services shown in this scheduleup to 100,000 miles (166 000 km) should be performed after 100,000miles (1 66 000 km) at the same intervals. The services shown at 150,000 miles (240 000 km) should be performed at the same interval after 150,000 miles (240 000 km). See "Owner Checks and Services'' and "Periodic Maintenance Inspections'?following. to check your brakes is during tire rotation. See "Brake System Inspection?'under "Periodic Maintenance Inspections" in Part C of this schedule. + A good time ** Drive axle service (see "Recommended Fluids and Lubricants" in the Index for proper lubricant to use): 0 Footnotes The U.S. Environmental Protection Agency or the California Air Resources Board has determined that the failure to perform this maintenance item will not nullify the emission warranty or limitrecall liability prior to the completion of the vehicle's useful life. We, however, urge that all recommended maintenance services be performed at the indicated intervals and the maintenance be recorded. # Lubricate the front suspension, ball joints, steering 0 Locking Differential -- Drain fluid and refill at first engine oil change. At subsequent oil changes, check fluid level and add fluid as needed. If driving in dusty areas or towing a trailer, drain fluid and refill every 15,000 miles (25 000 km). Standard Differential -- Check fluid level and add fluid as needed at every oil change. If driving in dusty areas or towing a trailer, drain fluid and refill every 15,000 miles (25 000 km). More frequent lubrication may be required for heavy-duty or off-road use. linkage and transfer case shift linkage, parking brake cable guides, propshaft splines, universal joints and brake pedal springs. 7-8