Cadillac 2010 CTS Owner's Manual

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8-50 Driving and Operatingunleaded 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 at 91octane or higher, the engine needsservice.Gasoline SpecificationsAt a minimum, gasoline shouldmeet ASTM specification D 4814in the United States or CAN/CGSB‐3.5 or 3.511 in Canada.Some gasolines contain anoctane-enhancing additive calledmethylcyclopentadienyl manganesetricarbonyl (MMT). We recommendagainst the use of gasolinescontaining MMT. See Fuel Additiveson page 8‑50 for additionalinformation.California FuelRequirementsIf the vehicle is certified to meetCalifornia Emissions Standards, it isdesigned to operate on fuels thatmeet California specifications.See the 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 4‑23. If this occurs, return toyour authorized dealer/retailer fordiagnosis. If it is determined that thecondition is caused by the type offuel used, repairs might not becovered by the vehicle warranty.Fuels in ForeignCountriesIf you plan on driving in anothercountry outside the United States orCanada, the proper fuel might behard to find. Never use leadedgasoline or any other fuel notrecommended in the previous texton fuel. Costly repairs caused byuse of improper fuel would not becovered by the vehicle warranty.To check the fuel availability, ask anauto club, or contact a major oilcompany that does business in thecountry where you will be driving.Fuel AdditivesTo provide cleaner air, all gasolinesin the United States are nowrequired to contain additives thathelp prevent engine and fuel systemdeposits from forming, allowing theemission control system to workproperly. In most cases, nothingshould have to be added to the fuel.