Operation Manual

158 Starting and driving
Recommended fuel:
For optimum performance we recommend:
• AON 90 for 2.0 Turbo 185 hp engines.
• AON 93 for 2.0 Turbo 205 hp engines and
2.3 Viggen.
Octane rating is determined according to
the formula:
where MON is the Motor Octane Number,
and RON is the Research Octane Number.
The average of these two values is the
octane rating of the gasoline as it appears
on the pump at a retail gas station. This
value is sometimes referred to as the
"Anti-Knock Index" (AKI) or the "Average
Octane Number" (AON).
To avoid deposit formation on the fuel injec-
tors which can cause poor driveability, use
only quality gasolines that contain deter-
gents and corrosion inhibitors. Because
gasolines sold at retail gas stations vary in
their composition and quality, you should
switch to a different brand if you begin expe-
riencing driveability and/or hard starting
problems shortly after refueling your car. In
recent years, a variety of fuel additives and
alcohols or oxygenates have been blended
with gasoline. These types of gasolines may
be found in all parts of the United States and
Canada, but particularly in geographic
areas and cities that have high carbon mon-
oxide levels. Saab approves the use of such
"reformulated" gasolines in its products,
which help in reducing pollution from all
motor vehicles, provided that the following
blending percentages are met by such
fuels:
• Up to 10% ethanol by volume, with corro-
sion inhibitors.
• Up to 15% MTBE by volume (methyl ter-
tiary butyl ether).
• Up to 5% methanol by volume, with an
equal amount of a suitable co-solvent and
added corrosion inhibitors.
NOTE
• Fill to maximum filling capacity
• Stop filling after the first time that the
nozzle trips to shut off the flow of fuel
• Filling capacity can differ between
different fuel stations and outside
temperature. Fuel tank volume when
nozzle trips to shut off, may vary by
0.5 gal. (2 liters).
• Do not fill fuel all the way up the filler
pipe. The gasoline must be allowed
room for expansion especially during
hot weather.
MON + RON
2
IB016