Safety Notes; Premium-Grade Unleaded Gasoline; Fuel; Important Safety Notes - Mercedes-Benz 2011 R-Class Operator's Manual

Service products and capacities
352

Fuel

Important safety notes

G
Warning!
Fuel is highly flammable. Fire, naked flames
and smoking are therefore prohibited when
handling fuels.
Switch off the engine and the auxiliary heating
before refueling.
G
Warning!
Gasoline and diesel fuels are highly flammable
and poisonous. They burn violently and can
cause serious injury.
Never allow sparks, flames or smoking
materials near gasoline or diesel fuel!
Turn off the engine before refueling.
Whenever you are around gasoline or diesel
fuel, avoid inhaling fumes and any skin or
clothing contact. Extinguish all smoking
materials.
Direct skin contact with fuels and the
inhalation of fuel vapors are damaging your
health.

Premium-grade unleaded gasoline

! To ensure the longevity and full
performance of the engine, only premium-
grade unleaded gasoline must be used.
If premium-grade unleaded gasoline is
unavailable and regular gasoline is used,
observe the following precautions:
only fill the fuel tank to half full with
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regular unleaded gasoline and add the
rest as soon as possible with premium-
grade unleaded gasoline.
do not drive at the maximum speed.
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avoid sudden acceleration.
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when the vehicle is carrying a light cargo,
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e.g. two passengers without luggage, do
not allow the engine to rev above
3000 rpm.
when the vehicle is fully loaded or being
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operated in mountainous terrain, do not
depress the accelerator pedal further
2
than / of the pedal travel.
3
Fuel requirements
Gasoline engines
Use only premium-grade unleaded gasoline.
The octane number should be at least 91.
Details can be found on the gas pump. The
octane number is the average value of the
Research Octane Number (RON) and Motor
Octane Number (MON): (RON + MON) / 2,
also known as knock resistance.
Reformulated Gasoline (RFG) and/or
unleaded gasoline with additives can be used
if the concentration of the additives in the fuel
does not exceed 10%, e.g.:
Ethanol
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TAME
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ETBE
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IPA
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TBA
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For MTBE, the concentration should not
exceed 15%.
The concentration of methanol in gasoline
including other additives must not exceed 3%.
Using mixtures of methanol and ethanol is not
permitted. Gasohol, a mixture of 10% ethanol
and 90% unleaded gasoline can be used.
All of these mix fuels must fulfill the fuel
requirements, e.g.:
knock resistance
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boiling point
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vapor pressure
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Diesel engines – important safety
information
! Only use commercially available ULTRA-
LOW SULFUR DIESEL FUEL (ULSD, 15 ppm
MAXIMUM SULFUR) that meets the
ASTM D975 standard. Failure to use
ULTRA-LOW SULFUR DIESEL FUEL (ULSD)
can severely damage the vehicle's exhaust
gas aftertreatment system.