1997 GMC Suburban Owner's Manual - Page 397

97,500 Miles (162 500 km) 0Change engine oil and filter (or every 12 months, whichever occurs first). An Emissim Corltrol Sel-vice. 100:""3 Miles (166 000 km) 0Replace spark plugs. An Emission Control S o r v i ~ ~ o . 0Lubricate chassis components (or every I2 months, whichever occurs first). (See footnote #. j 0Check readfront axle fluid level add fluid and as needed. Check constant velocity joints and axle seals for leaking. (See footnote **.) 0 Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation pattern and additional information. (See footnote +.) 0Change automatic transmission fluid and filter if the vehicle is mainly driven under one or more of these conditions: - In heavy city traffic where the outside temperature regularly reaches 90°F (32°C) or higher. (Continued) R / -41 A l