Black plate (54,1)Cadillac SRX Owner Manual (GMNA-Localizing-MidEast-8087806) - 2015 -CRC 1st Edition - 5/19/149-54 Driving and Operatingoperation; the vehicle does not needservice. Turn LDW off if theseconditions continue.FuelUse the recommended fuel forproper vehicle maintenance.Use regular unleaded gasoline witha posted octane rating of 91 RON orhigher, otherwise an audibleknocking noise may be heard.If heavy knocking is heard whenusing gasoline rated at 91 RON orhigher, the engine needs service.Use of Seasonal FuelsUse summer and winter fuels in theappropriate season. The fuelsindustry automatically modifies thefuel for the appropriate season.If fuel is left in the vehicle tank forlong periods of time, driving orstarting could be affected. Drive thevehicle until the fuel is at one-halftank or less, then refuel with thecurrent seasonal fuel.Prohibited FuelsGasolines containing oxygenatessuch as ethers and ethanol, as wellas reformulated gasolines, areavailable in some cities. If thesegasolines comply with thepreviously described specification,then they are acceptable to use.However, E85 (85% ethanol) andother fuels containing more than15% ethanol must be used only inFlexFuel vehicles.{ CautionDo not use fuel containingmethanol. It can corrode metalparts in the fuel system and alsodamage plastic and rubber parts.That damage would not becovered under the vehiclewarranty.Some gasolines, mainly high octaneracing gasolines, can contain anoctane-enhancing additive calledmethylcyclopentadienyl manganesetricarbonyl (MMT). Do not usegasolines and/or fuel additives withMMT as they can reduce spark pluglife and affect emission controlsystem performance. The
