Adding Equipment To The Outside Of The Vehicle; Fuel; Gasoline Octane - Pontiac G6 2009 Owner's Manual

Keep a record with all parts receipts and list the
mileage and the date of any service work performed.
See Maintenance Record on page 6-17.
Adding Equipment to the Outside of
the Vehicle
Things added to the outside of the vehicle can affect the
airflow around it. This can cause wind noise and can
affect fuel economy and windshield washer performance.
Check with your dealer/retailer before adding equipment
to the outside of the vehicle.

Fuel

Use of the recommended fuel is an important part of the
proper maintenance of this vehicle. To help keep the
engine clean and maintain optimum vehicle performance,
we recommend the use of gasoline advertised as
TOP TIER Detergent Gasoline.
The 8th digit of the Vehicle Identification Number (VIN)
shows the code letter or number that identifies the
vehicle's engine. The VIN is at the top left of the
instrument panel. See Vehicle Identification Number
(VIN) on page 5-109.
5-6
If the vehicle has the 3.5L V6 engine (VIN Code K),
you can use either unleaded gasoline or ethanol
fuel containing up to 85% ethanol (E85). See Fuel E85
(85% Ethanol) on page 5-8. In all other engines, use
only the unleaded gasoline described under Gasoline
Octane on page 5-6.

Gasoline Octane

If the vehicle has the 2.4L L4 engine (VIN Code B),
the 3.5L V6 engine (VIN Code K), the 3.5L V6 engine
(VIN Code N), or the 3.9L V6 engine (VIN Code 1), use
regular unleaded gasoline with a posted octane rating of
87 or higher. If the octane rating is less than 87, you
might notice an audible knocking noise when you drive,
commonly referred to as spark knock. If this occurs, use a
gasoline rated at 87 octane or higher as soon as possible.
If you are using gasoline rated at 87 octane or higher and
you hear heavy knocking, 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,
you might notice an audible knocking noise when you
drive, commonly referred to as spark knock. If this occurs,
use a gasoline rated at 87 octane or higher as soon as
possible. If you are using gasoline rated at 87 octane or
higher and you hear heavy knocking, the engine needs
service.