1997 Chevrolet Express Van Owner's Manual - Page 333

I Short Trip/City Maintenance Schedule-- Gasoline Engines I 99,000 Miles (165 000 km) 0Change engine oil andfilter (or every 3 months, whichever occurs first). An Emission. Control Service. I 100,000 Miles (166 000 km) 0Inspect spark plug wires. An Emission Control Service. 0Replace spark plugs. An Emission Control Service. 0Lubricate chassis components (or every 3 months, whichever occurs first). (See footnote #.) t Check axle fluid level and add fluid ] as needed. (See footnote **.) 0Change automatic transmission fluid and filter if the vehicle's GVWR is over 8600 lbs. or if the vehicle is mainly driven under one or more of these conditions: - In heavy city traffic where the outside temperature regularly reaches90 O F (32O C) or higher. DATE ACTUAL MILEAGE SERVICED B Y 7-30