1995 GMC Sonoma Owner's Manual - Page 313

I Schedule Maintenance 99,000 Miles (165 000 km) I I Change engine oil and filter (or every 3 months, whichever occurs first). An Emission Control Service. 0 Lubricate the front suspension, ball joints, steering linkage and transfer case shift linkage, parking brake cable guides, propshaft splines, universal joints, brake pedal springs, and clutch pedal springs (or every 6 months, whichever occurs first). Check readfront axlefluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking.** I DATE ACTUAL MILEAGE SERVICED BY: 100,000 Miles (166 000km) 0 Replace spark plugs (2.2L Code4 engine only). An Emission Control Service. 0 Change automatic transmission fluid and filter if the vehicle is mainly driven under one ormore of these conditions: - In heavy city traffic where the outside temperature regularly reaches 90°F (32°C) orhigher. When doing frequent trailer towing. - In hilly or mountainous terrain. - - Uses such as found in taxi, police or delivery service. I f you do not usevour vehicle under any of these conditions, the fluid mdfilter do not require changing. Manual transmission fluid doesn't require change. 7-25