If the vehicle has the 4.6L V8 engine (VIN Code A), usepremium unleaded gasoline with a posted octane ratingof 91 or higher. You can also use regular unleadedgasoline rated at 87 octane or higher, but the vehicle’sacceleration could be slightly reduced, and you mightnotice a slight audible knocking noise, commonly referredto as spark knock. If the octane is less than 87, you mightnotice a heavy knocking noise when you drive. If thisoccurs, use a gasoline rated at 87 octane or higher assoon as possible. Otherwise, you could damage theengine. If you are using gasoline rated at 87 octane orhigher and you hear heavy knocking, the engine needsservice.Gasoline SpecificationsAt a minimum, gasoline should meet ASTM specificationD 4814 in the United States or CAN/CGSB-3.5 or 3.511in Canada. Some gasolines contain an octane-enhancingadditive called methylcyclopentadienyl manganesetricarbonyl (MMT). We recommend against the use ofgasolines containing MMT. See Additives on page 5-7for additional information.California FuelIf the vehicle is certified to meet California EmissionsStandards, it is designed to operate on fuels that meetCalifornia specifications. See the underhood emissioncontrol label. If this fuel is not available in states adoptingCalifornia emissions standards, the vehicle will operatesatisfactorily on fuels meeting federal specifications, butemission control system performance might be affected.The malfunction indicator lamp could turn on and thevehicle might fail a smog-check test. See MalfunctionIndicator Lamp on page 3-39. If this occurs, return to yourauthorized dealer/retailer for diagnosis. If it is determinedthat the condition is caused by the type of fuel used,repairs might not be covered by the vehicle warranty.5-6
