Mercedes-Benz ML320. Service manual - part 119

 

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Mercedes-Benz ML320. Service manual - part 119

 

 

303

Technical data

Fuels, coolants, lubricants etc.

Premium unleaded gasoline

Fuel requirements

Use only premium unleaded 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 num-
ber 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.

Gasoline additives

A major concern among engine manufac-
turers is carbon build-up caused by gaso-
line. Mercedes-Benz recommends only the 
use of quality gasoline containing additives 
that prevent the build-up of carbon depos-
its.

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 en-
gine performance problems such as:

Warm-up hesitation

Unstable idle

Knocking/pinging

Misfire

Power loss

Do not blend other specific fuel additives 
with fuel. This only results in unnecessary 
costs and may be harmful to the engine 
operation.

!

To maintain the engine’s durability and 
performance, premium unleaded gaso-
line must be used. If premium unleaded 
is not available and low octane fuel is 
used, follow these precautions:

Have the fuel tank only partially 
filled with unleaded regular and fill 
up with premium unleaded as soon 
as possible.

Avoid full throttle driving and abrupt 
acceleration.

Do not exceed an engine speed of 
3000 rpm if the vehicle is loaded 
with a light load such as two per-
sons and no luggage.

Do not exceed 

2

/

3

 of maximum ac-

celerator pedal position if the vehi-
cle is fully loaded or operating in 
mountainous terrain.

304

Technical data

Fuels, coolants, lubricants etc.

Damage or malfunctions resulting from 
poor fuel quality or from blending specific 
fuel additives are not covered by the 
Mercedes-Benz Limited Warranty.

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 -35°F (-37°C) and corro-
sion protection.

If the antifreeze mixture is effective to 
-22°F (-30°C), the boiling point of the cool-
ant in the pressurized cooling system is 
reached at approximately 266°F (130°C).

The coolant solution must be used year 
round to provide the necessary corrosion 
protection and increase in boil-over pro-
tection. Refer to Service Booklet for 
replacement interval.

To provide important corrosion protection, 
the solution must be at least 45% 
anticorrosion/antifreeze (equivalent to 
freeze protection to approx. - 22°F 
[-30°C]). If you use a solution that is more 
than 55% anticorrosion/antifreeze (freeze 
protection to approx. - 49°F [-45°C]), the 
engine temperature will increase due to 
the lower heat transfer capability of the so-
lution. Therefore, do not use more than 
this amount of anticorrosion/antifreeze.

If the coolant level is low, water and MB 
anticorrosion/antifreeze should be used 
to bring it up to the proper level (have cool-
ing system checked for signs of leakage). 
Please make sure the mixture is in accor-
dance with label instructions.

The water in the cooling system must meet 
minimum requirements, which are usually 
satisfied by normal drinking water. If you 
are not sure about the water quality, con-
sult your authorized Mercedes-Benz Light 
Truck Center.

305

Technical data

Fuels, coolants, lubricants etc.

Anticorrosion/ antifreeze

Your vehicle contains a number of alumi-
num parts. The use of aluminum compo-
nents in motor vehicle engines 
necessitates that 
anticorrosion/antifreeze coolant used in 
such engines be specifically formulated to 
protect the aluminum parts. (Failure to use 
such anticorrosion/antifreeze coolant will 
result in a significantly shortened service 
life.)

Therefore, the following product is strongly 
recommended for use in your vehicle: 
Mercedes-Benz Anticorrosion/Antifreeze 
agent.

Before the start of the winter season (or 
once a year in hot southern regions), you 
should have the anticorrosion/antifreeze 
concentration checked. The coolant is also 
regularly checked each time you bring your 
vehicle to your authorized Mercedes-Benz 
Light Truck Center for service.

306

Technical data

Fuels, coolants, lubricants etc.

Anticorrosion/antifreeze quantity

Model

Approx. freeze protection

– 35°F (– 37°C)

– 49°F (– 45°C)

ML 350, ML 500,

6.4 US qt (6.0 l)

7.0 US qt (6.6 l)

 

 

 

 

 

 

 

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