Fuel; Engine Oil - Saab 9001994 Owner's Manual

Charge air cooler (intercooler)
A charge air cooler is fitted in front of the
radiator on the Saab 900 Turbo. The flow
of air through the cooler (ram effect) cools
the intake air, enabling a greater volume of
air and fuel to be admitted to the combus-
tion chamber, thereby increasing engine
power without impairing fuel economy.
Fuel
The fuel tank holds 18.0 U.S. gallons (68
liters). The fuel warning light will come on
when the amount of fuel left in the tank is
below approximately 2.5-3.1 U.S. gallons
(10-12 liters).
Recommended fuel
Except for the special performance Turbo
models, use unleaded gasoline octane rat-
ing 87 or higher.
Note! For special performance Turbo
models, premium fuel, minimum octane
rating 90.5 is required.
Octane rating is arrived at with the formula
MON +RON .
2
=
octane rating
MON is the industry Motor Octane Number.
RON is Research Octane Number. The av-
erage of these two is the number that ap-
pears on the gas pump under Federal law.
This number is sometimes referred to as
Car care and technical information 69
the "antiknock index" or Average Octane
Number (AON).
To avoid deposit formation on the fuel in-
jectors which can adversly affect perfor-
mance and cause driveability problems af-
ter a cold start, use only quality gasolines
which are blended with detergent/dis-
persant additives.
Use of gasoline-alcohol blends
Gasoline-ethanol blends (gasohol):
• have sufficient octane rating and are safe
to use in Saab engines if the blend does
not exceed 10% by volume.
• may cause warm starting problems in hot
weather. Discontinue use if this occurs.
• may require fuel filter replacement soon
after beginning continuous use.
Gasoline-methanol blends:
• are safe to use in Saab engines and fuel
systems providing that the ratio of meth-
anol to gasoline does not exceed 5% by
volume and that the blend contains a co-
solvent such a TBA in amounts equal to
the methanol to gasoline percentage
blend ratio.
Gasoline-methyl
(MTBE) blends:
tertiary-butyl ether
• are safe to use in Saab engines and fuel
systems providing that the ratio of MTBE-
to-gasoline does not exceed 15% by vol-
ume.
Oil filler cap with dipstick
SG 882
Failure or damage caused by using gaso-
lines with excessive alcohol blends (more
than the above recommended blending
percentages) are not covered by the war-
ranty.
Engine oil
Check the oil level in the engine regularly.
Make sure the car is on level ground and
properly parked and allow the engine to
cool for between two and five minutes. Re-
move the dipstick, wipe it on a clean rag
and then check the level. The level must
never be allowed to drop below the mini-
mum mark on the dipstick but nor should
the level be topped up higher than the max-
imum mark as this can result in excessive
oil consumption. The distance between the
maximum and minimum marks on the dip-