Page 395 of 569

394 Operation
Tires and wheels
Bar
Another metric unit for air pressure. There 
are 14.5038 pounds per square inch (psi) 
to 1 bar; there are 100 kilopascals (kPa) 
to 1 bar.
Bead
The tire bead contains steel wires wrapped 
by steel cords that hold the tire onto the 
rim.
Cold tire inflation pressure
Tire inflation pressure when your vehicle 
has been sitting for at least 3 hours or 
driven no more than 1 mile (1.6 km). 
Curb weight
The weight of a motor vehicle with stan-
dard equipment including the maximum 
capacity of fuel, oil, and coolant, and, if so 
equipped, air conditioning and additional 
optional equipment, but without passen-
gers and cargo.DOT (Department of Transportation)
A tire branding symbol which denotes the 
tire meets requirements of the 
U.S. Department of Transportation.
GAWR (G
ross Axle Weight Rating)
The GAWR is the maximum permissible 
axle weight. The gross vehicle weight on 
each axle must never exceed the GAWR for 
the front and rear axle indicated on the 
certification label located on the driver’s 
door B-pillar.
GTW (G
ross Trailer Weight)
The GTW is the weight of the trailer plus 
the weight of all cargo, equipment, luggage 
etc. loaded on the trailer. GVW (G
ross Vehicle Weight)
The GVW comprises the weight of the 
vehicle including fuel, tools, spare wheel, 
installed accessories, passengers and 
cargo and, if applicable, trailer tongue 
load. The GVW must never exceed the 
GVWR indicated on the certification label 
located on the driver’s door B-pillar.
GVWR (G
ross Vehicle Weight Rating)
This is the maximum permissible vehicle 
weight of the fully loaded vehicle (weight of 
the vehicle including all options, passen-
gers, fuel, and cargo and, if applicable, 
trailer tongue load). It is indicated on certi-
fication label located on the driver’s door 
B-pillar.
Kilopascal (kPa)
The metric unit for air pressure. There are 
6.9 kPa to 1 psi; another metric unit for air 
pressure is bars. There are 100 kilopascals 
(kPa) to 1 bar. 
     
        
        Page 537 of 569

536 Technical data
Fuels, coolants, lubricants, etc.
Capacities
Vehicle components and their respective 
lubricants must match. Therefore only use 
products tested and approved by 
Mercedes Benz.
Please refer to the Factory Approved 
Service Products pamphlet (USA only), or 
inquire at an Mercedes-Benz Light Truck 
Center.
Warning!G
Comply with all valid regulations with re-
spect to handling, storing and disposing of 
service fluids. Otherwise you could endan-
ger persons or the environment.
Keep service fluids out of the reach of chil-
dren.
For health reasons, you should prevent 
service fluids from coming into direct 
contact with your skin or clothing.
If a service fluid is swallowed, contact a 
physician immediately.
ModelCapacityFuels, coolants, lubricants, etc.
Engine with oil filterR 320 CDI 4MATIC9.0 US qt (8.5 l)Approved engine oils
R 3501, R 350 4MATIC
1USA only.
8.5 US qt (8.0 l)
R 550 4MATIC2
2Canada only.
9.5 US qt (9.0 l)
Automatic transmission9.5 US qt (9.0 l)MB Automatic Transmission Fluid
Transfer case0.53 US qt (0.5 l)MB Automatic Transmission Fluid
Rear axle1.2 US qt (1.1 l)Hypoid gear oil
Front axle1.2 US qt (1.1 l)Hypoid gear oil 
     
        
        Page 539 of 569

538 Technical data
Fuels, coolants, lubricants, etc.
Engine oils
Engine oils are specifically tested for their 
suitability in our engines and durability for 
our service intervals. Therefore, only use 
approved engine oils and oil filters 
required for vehicles with Maintenance 
System. For a listing of approved engine 
oils and oil filters, refer to the Factory 
Approved Service Products pamphlet (USA 
only), or contact an authorized 
Mercedes-Benz Light Truck Center.Engine oil additives
Air conditioning refrigerant
R-134a (HFC) refrigerant and special PAG 
lubricating oil are used in the air condition-
ing system.
ModelCapacityFuels, coolants, lubricants, etc.
Air conditioning systemR-134a refrigerant and special PAG lubricant 
oil (never R-12)
Windshield washer 
system and headlamp 
cleaning system*8.0 US qt (7.6 l)MB Windshield Washer Concentrate1
1Use MB Windshield Washer Concentrate “MB SummerFit” and water for temperatures above freezing point or MB Windshield Washer Concentrate “MB SummerFit” 
and commercially available premixed windshield washer solvent/antifreeze for temperatures below freezing point. Follow suggested mixing ratios (page 544).
!Using engine oils and oil filters of 
specification other than those expressly 
required for the Maintenance System, or chang-
ing of oil and oil filter at change intervals longer 
than those called for by the Maintenance System 
will result in engine or emission control system 
damage not covered by the Mercedes-Benz 
Limited Warranty.
Please follow Maintenance System recommen-
dations for scheduled oil changes. Failure to do 
so will result in engine or emission control 
system damage not covered by the 
Mercedes-Benz Limited Warranty.
!Do not blend oil additives with engine oil. 
They may damage the engine.
Damage or malfunctions resulting from blending 
oil additives are not covered by the 
Mercedes-Benz Limited Warranty.
!Never use R-12 (CFC) or mineral-based 
lubricating oil. Otherwise damage to the system 
will occur.