K 1500 Yukon Denali AWD V8-6.0L VIN U (2002)
Fuel: Description and Operation
FUEL SYSTEM SPECIFICATIONS
Use regular unleaded gasoline rated at 87 octane or higher. The manufacturer recommends that the gasoline meet the specifications which have been
developed by the American Automobile Manufacturers Association (AAMA) and endorsed by the Canadian Motor Vehicle Manufacturers Association
for better vehicle performance and engine protection. Gasoline meeting the AAMA specification may provide improved driveability and emission
control system performance compared to other gasoline. For more information, write to: American Automobile Manufacturer's Association, 7430 Second
Ave., Suite 300, Detroit, MI, 48202.
Verify that the posted octane is at least 87. If the octane is less than 87, you may get a heavy knocking noise when you drive. If the engine knock is bad
enough, your engine may be damaged.
If you are using fuel rated at 87 octane or higher and you hear heavy knocking, your engine needs service. Do not worry if you hear a little pinging noise
when you are accelerating or driving up a hill. This is normal and you do not have to buy a higher octane fuel to get rid of pinging. Only the heavy,
constant knock means that you have a problem.
NOTE: Your vehicle was not designed for fuel that contains methanol. Do not use methanol fuel which car corrode metal parts in your fuel system and
also damage plastic and rubber parts. This kind of damage would not be covered under your warranty.
If your vehicle is certified to meet California emission standards, indicated on the underhood emission control label, your vehicle is designed to operate
on fuels that meet California specifications. If such fuels are not available in states adopting California emission standards, your vehicle operates
satisfactorily on fuels meeting federal specifications, but emission control system performance may be affected. The Malfunction Indicator Lamp (MIL)
on your instrument panel may turn ON, and your vehicle may fail a smog-check test. If this occurs, return to your authorized dealer for diagnosis in order
to determine the cause of failure. In the event that the cause of the condition is determined to be the type of fuels used, repairs may not be covered by
your warranty.
Some gasolines that are not reformulated for low emissions may contain an octane-enhancing additive called Methylcyclopentadienyl Manganese
Tricarbonyl (MMT). Ask your service station operator whether or not the fuel contains MMT.
