Adding Equipment To The Outside Of The Vehicle; Fuel; Gasoline Octane - Cadillac 2009 Escalade EXT Owner's Manual

This vehicle has an airbag system. Before attempting to
do your own service work, see Servicing Your
Airbag-Equipped Vehicle on page 1-67.
Keep a record with all parts receipts and list the mileage
and the date of any service work performed. See
Maintenance Record on page 7-17.
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.
This vehicle can use either unleaded gasoline or
ethanol fuel containing up to 85% ethanol (E85). See
Gasoline Octane on page 6-5 and Fuel E85 (85%
Ethanol) on page 6-8.

Gasoline Octane

Use premium unleaded gasoline with a posted octane
rating of 91 or higher. You can also use regular
unleaded gasoline rated at 87 octane or higher, but the
vehicle's acceleration could be slightly reduced, and
you might notice a slight audible knocking noise,
commonly referred to as spark knock. If the octane is
less than 87, you might notice a heavy knocking
noise when you drive. If this occurs, use a gasoline
rated at 87 octane or higher as soon as possible.
Otherwise, you could damage the engine. If you are
using gasoline rated at 87 octane or higher and you hear
heavy knocking, the engine needs service.
6-5