Page 329 of 473

328 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 three 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.
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 GWV must never exceed the 
GWVR 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 
certification 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.
Maximum load rating
The maximum load in kilograms and 
pounds that can be carried by the tire.
Maximum loaded vehicle weight
The sum of curb weight, accessory weight, 
total load limit and production options 
weight. 
     
        
        Page 444 of 473

443 Technical data
Fuels, coolants, lubricants, etc.
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 authorized Mercedes-Benz 
Center.
Warning!G
Comply with all valid regulations with 
respect to handling, storing and disposing 
of service fluids. Otherwise you could 
endanger persons or the environment.
Keep service fluids out of the reach of 
children.
For health reasons, you should prevent 
service fluids from coming into direct 
contact with you skin or clothing.
If a service fluid is swallowed, contact a 
physician immediately.
ModelCapacityFuels, coolants, lubricants etc.
Engine with oil filterAll models8.5 US qt (8.0 l)Approved engine oils
Automatic transmission*SLK 280, SLK 3509.5 US qt (9.0 l)MB Automatic Transmission Fluid
SLK 55 AMG9.2 US qt (8.7 l)
Manual transmissionSLK 280, SLK 3501.6 US qt (1.5 l)MB Manual Transmission Oil
Rear axleSLK 2801.1 US qt (1.0 l)Hypoid gear oil SAE 85 W 90
SLK 3501.2 US qt (1.1 l)
SLK 55 AMG1.3 US qt (1.2 l) 
     
        
        Page 445 of 473

444 Technical data
Fuels, coolants, lubricants, etc.
ModelCapacityFuels, coolants, lubricants etc.
Power steeringAll models1.1 US qt (1.0 l)MB Power Steering Fluid (Pentosin CHF 11S or, 
depending on vehicle production date, Chevron 
Texaco PSF 9109)
1
Front wheel hubsAll modelsapprox. 2.1oz (60g) eachHigh temperature roller bearing grease
Brake systemAll models0.5 US qt (0.5 l)MB Brake Fluid (DOT 4+)
Cooling systemSLK 280approx. 10.4 US qt (9.8 l)MB 325.0 Anticorrosion/Antifreeze Agent
SLK 350approx. 10.4 US qt (9.8 l)
SLK 55 AMGapprox. 11.7 US qt (11.1 l)
Fuel tankAll modelsapprox. 18.5 US gal (70.0 l)Premium unleaded gasoline:
Minimum posted Octane 91 (average of 
96 RON/86 MON)
including a reserve ofSLK 280, SLK 350
SLK 55 AMGapprox. 2.4 US gal (9.0 l)
approx. 2.6 US gal (10.0 l)
Air conditioning systemAll modelsR-134a refrigerant and special PAG lubricant oil 
(never R-12)
Hydraulic system for 
retractable hardtopAll models0.19 US qt (0.18 l)MB Hydraulic Fluid
Windshield washer 
system and headlamp 
cleaning system*All models7.4 US qt (7.0 l)MB Windshield washer concentrate2
1For detailed information, please refer to the Factory Approved Service Products pamphlet (USA only) or contact an authorized Mercedes-Benz Center.2Use 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 450).