Page 67 of 464

67 Safety and Security
Occupant safety
Emergency tensioning device (ETD), 
seat belt force limiter
The seat belts for the front and rear seats 
are equipped with emergency tensioning 
devices and belt force limiters.
The ETD is designed to activate in the fol-
lowing cases when the seat belt are fas-
tened and:
in frontal or rear-end impacts 
exceeding a preset severity level
if the restraint systems are operational 
and functioning correctly. See 
1indicator lamp (
page 58)In an impact, emergency tensioning devic-
es remove slack from the belts in such a 
way that the seat belts fit more snugly 
against the body. Belt force limiters reduce 
the force exerted by the seat belts on oc-
cupants during a crash.
Never use a seat belt for more than one 
person at a time. Do not fasten a seat 
belt around a person and another per-
son or other objects.
Belts should not be worn twisted. In a 
crash, you wouldn’t have the full width 
of the belt to manage impact forces. The 
twisted belt against your body could 
cause injuries.
Pregnant women should also use a 
lap-shoulder belt. The lap belt portion 
should be positioned as low as possible 
on the hips to avoid any possible pres-
sure on the abdomen.
Never place your feet on the instrument 
panel or on the seat. Always keep both 
feet on the floor in front of the seat.
Warning!
G
An emergency tensioning device (ETD) that 
was activated must be replaced.
When disposing of the emergency tension-
ing device, our safety instructions must be 
followed. These are available at your autho-
rized Mercedes-Benz Center. 
     
        
        Page 306 of 464

306 OperationVehicle careEngine cleaning
Prior to cleaning the engine compartment, 
make sure to protect electrical compo-
nents and connectors from the intrusion of 
water and cleaning agents.
Corrosion protection, such as MB Anticor-
rosion Wax, should be applied to the en-
gine compartment after every engine 
cleaning. Before applying, all control link-
age bushings and joints should be lubricat-
ed. The poly-V-belt and all pulleys should 
be protected from any wax. 
Vehicle washing
Do not use hot water or wash your vehicle 
in direct sunlight. Only use a mild car wash 
detergent, such as Mercedes-Benz ap-
proved Car Shampoo.
Thoroughly spray the vehicle with a dif-
fused jet of water. Direct only a very weak 
spray towards the ventilation intake. Use 
plenty of water and rinse the sponge and 
chamois frequently. Rinse with clear water and thoroughly dry 
with a chamois. Do not allow cleaning 
agents to dry on the finish.
Due to the width of the vehicle, fold in out-
side mirrors prior to running the vehicle 
through an automatic car wash to prevent 
damage to the mirrors.
In the winter, thoroughly remove all traces 
of road salt as soon as possible.
When washing the underbody, do not for-
get to clean the inner sides of the wheels.Soft top
Clean soft top with soft top raised and 
locked. Lower the soft top into the storage 
compartment only if the soft top is com-
pletely dry. If the soft top is kept in the 
storage compartment for a lengthy period, 
raise it and air out with the windows open 
about every 4 months.
Light colored soft tops should be cleaned 
frequently to prevent spots and dirt from 
setting in, which could stain and discolor 
the soft top material permanently.
iVehicles with KEYLESS-GO*:
If a door handle is hit by a strong jet of 
water, and a SmartKey with 
KEYLESS-GO* is in close proximity, i.e. 
within approx. 3 ft (approx. 1 m), the 
vehicle could be inadvertently locked 
or unlocked. 
!Remove bird droppings immediately. 
The organic acid damages the material 
and causes the soft top to leak
Never use a power washer to clean the 
soft top, as you may damage the soft 
top material.
Do not use sharp-edged instruments 
for the removal of ice and snow. 
     
        
        Page 408 of 464
408 Technical dataMain dimensions
Main dimensionsModel
CLK 320
CLK 500
CLK 55 AMG
Overall vehicle length
182.6 in (4 638 mm)
182.6 in (4 638 mm)
182.6 in (4 638 mm)
Overall vehicle width
68.5 in (1 740 mm)
68.5 in (1 740 mm)
68.5 in (1 740 mm)
Overall vehicle height
55.4 in (1 406 mm)
55.4 in (1 408 mm)
55.4 in (1 408 mm)
Overall vehicle height when 
opening/closing soft top
80.9 in (2 055 mm)
81.0 in (2 057 mm)
80.6 in (2 047 mm)
Wheelbase
106.9 in (2 715 mm)
106.9 in (2 715 mm)
106.9 in (2 715 mm)
Track, front
58.8 in (1 493 mm)
58.9 in (1 497 mm)
58.9 in (1 497 mm)
Track, rear
58.0 in (1 474 mm)
58.2 in (1 478 mm)
58.2 in (1 478 mm) 
     
        
        Page 417 of 464

417 Technical data
Consumer information
Consumer information
The following text is published as required 
of all manufacturers of passenger cars un-
der Title 49, Code of U.S. Federal Regula-
tions, Part 575 pursuant to the “National 
Traffic and Motor Vehicle Safety Act of 
1966”.Uniform tire quality grading
Quality grades can be found, where appli-
cable, on the tire sidewall between tread 
shoulder and maximum section width. For 
example:
All passenger car tires must conform to 
federal safety requirements in addition to 
these grades.Tread wear
The tread wear grade is a comparative rat-
ing based on the wear rate of the tire when 
tested under controlled conditions on a 
specified government test course. For ex-
ample, a tire graded 150 would wear one 
and one-half (1½) times as well on the gov-
ernment course as a tire graded 100. The 
relative performance of tires depends 
upon the actual conditions of their use, 
however, and may depart significantly 
from the norm due to variations in driving 
habits, service practices and differences in 
road characteristics and climate.Traction
The traction grades, from highest to lowest 
are AA, A, B, and C. Those grades repre-
sent the tire’s ability to stop on wet pave-
ment as measured under controlled 
conditions on specified government test 
surfaces of asphalt and concrete. A tire 
marked C may have poor traction perfor-
mance.Tread wear
Traction
Temperature
200
AA
A
Warning!
G
The traction grade assigned to this tire is 
based on straight ahead braking traction 
tests, and does not include acceleration, 
cornering, hydroplaning, or peak traction 
characteristics.