Saturn 2010 AURA - Manual (Page 276)

Gasoline Octane
If the vehicle has the 2.4L L4 engine (VIN Code 0), 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.
If the vehicle has the 3.6L V6 engine (VIN Code 7),
use regular unleaded gasoline with a posted octane
rating of 87 or higher. For best performance or trailer
towing, you could choose to use middle grade 89 octane
unleaded gasoline. 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 Additives on page 6-7 for
additional information.
California Fuel
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 4-34.
If this occurs, return to your authorized dealer/retailer 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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