2006 Pontiac Vibe Owner's Manual - Page 241
2006 Pontiac Vibe Manual
Page 241 highlights
Adding Equipment to the Outside of Your Vehicle Things you might add to the outside of your vehicle can affect the airflow around it. This may cause wind noise and affect windshield washer performance. Check with your dealer before adding equipment to the outside of your vehicle. Gasoline Octane If your vehicle has the 1.8L engine (VIN Code 8), use regular unleaded gasoline with a posted octane rating of 87 or higher. If the octane rating is less than 87, you may notice an audible knocking noise when you drive, commonly referred to as spark knock. If this occurs, use a gasoline rated at 87 octane or higher as soon as possible. If you are using gasoline rated at 87 octane or higher and you hear heavy knocking, your engine needs service. If your vehicle has the 1.8L H.O. DOHC engine (VIN Code L), use premium unleaded gasoline with a posted octane rating of 91 or higher. In an emergency, you can use regular unleaded gasoline with an octane rating of 87 or higher. If 87 octane fuel is used, do not perform any aggressive driving maneuvers such as wide open throttle applications. You may also hear audible spark knock during acceleration. Refill your tank with premium fuel as soon as possible to avoid damaging your engine. If you are using gasoline rated at 91 octane or higher and you hear heavy knocking, your engine needs service. Fuel The 8th digit of your vehicle identification number (VIN) shows the code letter or number that identifies your engine. You will find the VIN at the top left of the instrument panel. See Vehicle Identification Number (VIN) on page 5-89. 5-5