Your vehicle has an airbag system. Beforeattempting to do your own service work, seeServicing Your Airbag-Equipped Vehicle onpage 58.You should keep a record with all parts receiptsand list the mileage and the date of any servicework you perform. See Maintenance Recordon page 477.Adding Equipment to the Outside ofYour VehicleThings you might add to the outside of yourvehicle can affect the airflow around it. This maycause wind noise and affect windshield washerperformance. Check with your dealer beforeadding equipment to the outside of your vehicle.FuelUse of the recommended fuel is an important partof the proper maintenance of your vehicle. Tohelp keep your engine clean and maintain optimumvehicle performance, GM recommends the useof gasoline advertised as TOP TIER DetergentGasoline.The 8th digit of your Vehicle Identification Number(VIN) shows the code letter or number thatidentifies your engine. You will find the VIN at thetop left of the instrument panel. See VehicleIdentification Number (VIN) on page 451.365