Fuel (Gasoline Engine); Gasoline Octane; Gasoline Specifications - GMC C series 2002 Owner's Manual

Fuel (Gasoline Engine)

If your vehicle has a diesel engine, see "Diesel Engine
Fuel" in this section. For vehicles with gasoline engines,
please read this.

Gasoline Octane

Use regular unleaded gasoline with a posted octane of
87 or higher. If the octane is less than 87, you may
get a heavy knocking noise when you drive. If it is
bad enough, it can damage your engine. A little pinging
noise when you accelerate or drive uphill is considered
normal. This does not indicate a problem exists or that
-
a higher octane fuel is necessary.
6-4

Gasoline Specifications

It is recommended that gasoline meet specifications
which were developed by the American Automobile
Manufacturers Association and endorsed by the
Canadian Vehicle Manufacturers' Association for better
vehicle performance and engine protection. Gasolines
meeting these specifications could provide improved
driveability and emission control system performance
compared to other gasolines.
Canada Only
In Canada, look for
the "Auto Makers'
Choice" label on
the pump.