1997 GMC Sonoma Owner's Manual - Page 373

Part E: Maintenance Record After the scheduled services are performed, record the date, odometer reading and who performed the service in the boxes provided after the maintenance interval. Any additional information from "Owner Checks and Services" or "Periodic Maintenance'' can be added on the following record pages. Also, you should retain all maintenance receipts. Your owner information portfolio is a convenientplace to store them. Maintenance Record