Cadillac 2012 CTS Owner's Manual

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Black plate (51,1)Cadillac CTS/CTS-V Owner Manual (Include Mex) - 2012Driving and Operating 9-51Recommended FuelIf the vehicle has a V6 engine, useregular unleaded gasoline with aposted octane rating of 87 or higher.If the octane rating is less than 87,an audible knocking noise,commonly referred to as sparkknock, might be heard when driving.If this occurs, use a gasoline ratedat 87 octane or higher as soon aspossible. If heavy knocking is heardwhen using gasoline rated at87 octane or higher, the engineneeds service.If the vehicle has the 6.2L V8 engine(VIN Code P), use premiumunleaded gasoline with a postedoctane rating of 91 or higher. Forbest performance, use premiumunleaded gasoline with a postedoctane rating of 93. In anemergency, you can use regularunleaded gasoline with an octanerating of 87 or higher. If 87 octanefuel is used, do not perform anyaggressive driving maneuvers suchas wide open throttle applications.You might also hear audible sparkknock during acceleration. Refill thetank with premium fuel as soon aspossible to avoid damaging theengine. If heavy knocking is heardwhen using gasoline rated at91 octane or higher, the engineneeds service.Gasoline Specifications(U.S. and Canada Only)At a minimum, gasoline should meetASTM specification D 4814 in theUnited States or CAN/CGSB‐3.5or 3.511 in Canada. Somegasolines contain anoctane-enhancing additive calledmethylcyclopentadienyl manganesetricarbonyl (MMT). We recommendagainst the use of gasolinescontaining MMT. See Fuel Additiveson page 9‑52 for additionalinformation.California FuelRequirementsIf the vehicle is certified to meetCalifornia Emissions Standards, it isdesigned to operate on fuels thatmeet California specifications. Seethe underhood emission controllabel. If this fuel is not available instates adopting California EmissionsStandards, the vehicle will operatesatisfactorily on fuels meetingfederal specifications, but emissioncontrol system performance mightbe affected. The malfunctionindicator lamp could turn on and thevehicle might fail a smog‐check test.See Malfunction Indicator Lamp onpage 5‑19. If this occurs, return toyour authorized dealer for diagnosis.If it is determined that the conditionis caused by the type of fuel used,repairs might not be covered by thevehicle warranty.