Engine Fan Breakage; Fuel; Gasoline Octane - Chevrolet 2009 Kodiak Owner's Manual

Engine Fan Breakage

CAUTION:
{
Changing the Fan Drive Ratio or Engine Governed
Speed:
If you change the fan drive ratio or increase the
governed speed of the engine, you might increase
stress and the fan could eventually fail. If the fan
breaks apart while rotating, pieces can cause
severe injury to anyone — such as a service
technician — who is nearby. And, of course, the
pieces can severely damage the vehicle. Do not
change the fan drive ratio or increase the
governed speed of the vehicle without getting the
necessary information from your dealer/retailer.
Winter Fronts, Grille Covers, or Obstructions:
Winter Fronts, grille covers, or other add-on
equipment causing obstructions in front of or
behind the fan should not be used on this vehicle.
If this causes the fan to eventually break apart
while rotating, the pieces can cause severe injury
to anyone nearby, such as a service technician
working on the engine, and, of course, the pieces
can severely damage the vehicle.
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Fuel

For diesel engine vehicles, see Diesel Engine Fuel on
page 5-8.
For vehicles with gasoline engines, please read this.
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.

Gasoline Octane

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.