466 Technical dataFuels, coolants, lubricants etc.Fuel requirements
Gasoline engine
Only use premium unleaded gasoline
meeting ASTM standard D 439.
The octane number (posted at the pump)
must be 91 “min”. It is an average of both
the Research (R) Octane Number and the
Motor (M) Octane Number: (R+M)/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.Diesel engine
Only use commercially available vehicular
diesel fuels No. 2 or No. 1 (ASTM D975
No.2-D or No.1-D).
To prevent malfunctions, diesel fuel with
better cold flow quality is offered in the
winter months. Check with your fuel
retailer.
Coolants
The engine coolant is a mixture of water
and anticorrosion/antifreeze, which pro-
vides:
Corrosion protection
Freeze protection
Boiling protection (by increasing the
boiling point)
The cooling system was filled at the factory
with a coolant providing freeze protection
to approximately -22°F (-30°C) and corro-
sion protection.
!Do not fill the tank with gasoline. Do
not mix diesel fuel with gasoline or ker-
osene. The fuel system and engine will
otherwise be damaged, which is not
covered by the Mercedes-Benz Limited
Warranty.
