1996 Buick Roadmaster Owner's Manual - Page 294

I Short TriplCity Maintenance Schedule I 9,000 Miles (15 000 km) 0Change engine oil and filter (or every 3 months, whichever occurs first). An Emission Control Service. 6,000 Miles (10 000' km) (Continued) 0Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation pattern and additional information. During tire rotation, check brake calipers for freedom of movement and lubricate if required. Change the rear axle gear lubricant if vehicle is used to pull a trailer or has limited-slip differential. * DATE MILEAGE ACTUAL SERVICED BY 7-8