2010 Hummer H3 Owner's Manual - Page 248

9-64 Driving and Operating The VIN is at the top left of the instrument panel. See Vehicle Identification Number (VIN) on page 12‑1. If the vehicle has the 5.3L V8 engine (VIN Code P), you can use either unleaded gasoline or ethanol fuel containing up to 85% ethanol (E85). See Fuel E85 (85% Ethanol) on page 9‑66. In all other engines, use only regular unleaded gasoline. Fuel 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. Look for the TOP TIER label on the fuel pump to ensure gasoline meets enhanced detergency standards developed by auto companies. A list of marketers providing TOP TIER Detergent Gasoline can be found at www.toptiergas.com. Recommended Fuel Use regular unleaded gasoline with a posted octane rating of 87 or higher. If the octane rating is less than 87, an audible knocking noise, commonly referred to as spark knock, might be heard when driving. If this occurs, use a gasoline rated at 87 octane or higher as soon as possible. If heavy knocking is heard when using gasoline rated at 87 octane or higher, the engine needs service. The 8th digit of the Vehicle Identification Number (VIN) shows the code letter or number that identifies the vehicle's engine.