Black plate (51,1)Cadillac Escalade EXT Owner Manual - 2012Driving and Operating 9-51Vehicles that have a FlexFuel badgeand a yellow fuel cap can use eitherunleaded gasoline or ethanol fuelcontaining up to 85% ethanol (E85).See Fuel E85 (85% Ethanol) onpage 9‑53. For all other vehicles,use only the unleaded gasolinedescribed under RecommendedFuel on page 9‑51.Recommended FuelUse premium unleaded gasolinewith a posted octane rating of 91 orhigher. You can also use regularunleaded gasoline rated at87 octane or higher, but thevehicle's acceleration could beslightly reduced, and a slight audibleknocking noise, commonly referredto as spark knock, might be heard.If the octane is less than 87, youmight notice a heavy knocking noisewhen you drive. If this occurs, use agasoline rated at 87 octane orhigher as soon as possible.Otherwise, you could damage 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 shouldmeet ASTM specificationD 4814 in the United States orCAN/CGSB‐3.5 or 3.511 inCanada. Some gasolines contain anoctane-enhancing additive calledmethylcyclopentadienyl manganesetricarbonyl (MMT). We recommendagainst the use of gasolinescontaining MMT. See Fuel Additiveson page 9‑52 for additionalinformation.InformationProvidedby:
