Recommended Fuel; Gasoline Specifications; California Fuel; Requirements - GMC Acadia 2011 Owner's Manual

Recommended Fuel

Use regular unleaded gasoline
with a posted octane rating of 87
or higher. If the octane rating is
less than 87, an audible knocking
noise, commonly referred to as
spark knock, might be heard
when driving. If this occurs, use
a gasoline rated at 87 octane or
higher as soon as possible. If heavy
knocking is heard when using
gasoline rated at 87 octane or
higher, the engine needs service.

Gasoline Specifications

At a minimum, gasoline should
meet ASTM specification
D 4814 in the United States or
CAN/CGSB 3.5 or 3.511 in Canada.
Some gasolines contain an
octane-enhancing additive called
methylcyclopentadienyl manganese
tricarbonyl (MMT). We recommend
against the use of gasolines
containing MMT. See Fuel Additives
on page 9 44 for additional
information.
Driving and Operating

California Fuel

Requirements

If the vehicle is certified to meet
California Emissions Standards,
it is designed to operate on fuels
that meet California specifications.
See the underhood emission control
label. If this fuel is not available in
states adopting California emissions
standards, the vehicle will operate
satisfactorily on fuels meeting
federal specifications, but emission
control system performance might
be affected. The malfunction
indicator lamp could turn on and the
vehicle might fail a smog check test.
See Malfunction Indicator Lamp on
page 5 18. If this occurs, return to
your authorized dealer for diagnosis.
If it is determined that the condition
is caused by the type of fuel used,
repairs might not be covered by the
vehicle warranty.
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