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Gasoline; Additives; Requirements; Fuel Requirements - Smart Fortwo coupe Operator's Manual

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Service fluids and capacities
222

Fuel requirements

Only use premium unleaded fuel. The octane
number (posted at the pump) must be 91 min.
It is an average of both the Research Octane
Number (RON) and the Motor Octane Number
(MON): (RON+MON)/2. This is also known as
the ANTI‑KNOCK INDEX.
Unleaded gasoline containing oxygenates
such as ethanol, IPA, IBA and TBA can be
used provided the ratio of any one of these
oxygenates to gasoline does not exceed
10%; MTBE must not exceed 15%.
The ratio of methanol to gasoline must not
exceed 3% plus additional cosolvents.
Using mixtures of ethanol and methanol is
not allowed. Gasohol, which contains 10%
ethanol and 90% unleaded gasoline, can be
used.
These blends must also meet all other fuel
requirements, such as resistance to spark
knock, boiling range, vapor pressure, etc.

Gasoline additives

A major concern among engine
manufacturers is carbon build-up caused
by gasoline. smart recommends only the use
of quality gasoline containing additives
that prevent the build-up of carbon
deposits.
After an extended period of using fuels
without such additives carbon deposits can
build up, especially on the intake valves
and in the combustion area, leading to
engine performance problems such as:
Warm-up hesitation
R
Unstable idle
R
Knocking/pinging
R
Misfire
R
Power loss
R
In areas where carbon deposits may be
encountered due to lack of availability of
gasolines which contain these additives,
Refer to the notes for use on the container.
28
the use of smart approved additives is
recommended. Contact an authorized smart
center for a listing of approved products.
Follow directions on the product label.
Do not blend other fuel additives with fuel.
This only results in unnecessary costs and
may be harmful to the engine operation.
! Damage or malfunction resulting from
poor fuel quality or from blending
additional fuel additives other than
those tested and approved by us for use
on smart vehicles are not covered by the
smart Limited Warranty.
Windshield/rear window washer system
During all seasons:
Use a windshield washer concentrate
X
labeled for summer and water for
temperatures above freezing point.
Use a windshield washer concentrate
X
labeled for winter and water for
temperatures below freezing point.
Premix the windshield washer fluid in a
X
suitable container depending on the
outside temperature and in accordance
with the manufacturer's instructions
Washer fluid mixing ratio
Temperature above 32¦ (0¥):
R
1 part windshield washer concentrate
labeled for summer to 100 parts water
Temperature of 14¦ (-10¥):
R
1 part windshield washer concentrate
labeled for winter to 2 parts water
Temperature of -4¦ (-20¥):
R
1 part windshield washer concentrate
labeled for winter to 1 part water
G
WARNING
Windshield washer concentrate is highly
flammable. Fire, naked flames and smoking
28
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