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.
See also:
Fuel Gauge
When the ignition is on, the fuel
gauge indicates how much fuel is
left in the tank.
An arrow on the fuel gauge
indicates the side of the vehicle the
fuel door is on.
The FUEL LEVEL LOW me ...
Cabin Luxury
The redesigned 2008 CTS was one of the prime examples of GM's renewed
commitment to interior quality, and the design has held up well over the past
few years; it still looks modern and inviting in ...
Gasoline Specifications (U.S. and Canada Only)
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 methylcyclopentadie ...