2009 GMC Savana Van Owner's Manual - Page 247

If doing some of your own service work, use the proper service manual. It tells you much more about how to service the vehicle than this manual can. To order the proper service manual, see Service Publications Ordering Information on page 7-16. This vehicle has an airbag system. Before attempting to do your own service work, see Servicing Your Airbag-Equipped Vehicle on page 1-77. Keep a record with all parts receipts and list the mileage and the date of any service work performed. See Maintenance Record on page 6-18. Fuel For diesel engine vehicles, see "Diesel Fuel Requirements and Fuel System" in the DURAMAX® Diesel manual. For vehicles with gasoline engines, please read this. Gasoline Use of the recommended fuel is an important part of the proper maintenance of this vehicle. To help keep the engine clean and maintain optimum vehicle performance, we recommend the use of gasoline advertised as TOP TIER Detergent Gasoline. The 8th digit of the Vehicle Identification Number (VIN) shows the code letter or number that identifies the vehicle's engine. The VIN is at the top left of the instrument panel. See Vehicle Identification Number (VIN) on page 5-103. If the vehicle has the 5.3L V8 engine (VIN Code 4) and the N15 flexible fuel option, you can use either regular unleaded gasoline or ethanol fuel containing up to 85% ethanol (E85). See Fuel E85 (85% Ethanol) on page 5-8. For the 5.3L V8 engine (VIN Code 4) without the N15 option and all other gasoline engines, use only regular unleaded gasoline. Adding Equipment to the Outside of the Vehicle Things added to the outside of the vehicle can affect the airflow around it. This can cause wind noise and can affect fuel economy and windshield washer performance. Check with your dealer/retailer before adding equipment to the outside of the vehicle. 5-5