Page 313 of 481

312 OperationEngine compartmentAdding engine oil
Only use approved engine oils and oil fil-
ters required for vehicles with 
Maintenance System (U.S. vehicles) or 
FSS PLUS (Canada vehicles). For a listing 
of approved engine oils and oil filters, refer 
to the Factory Approved Service Products 
pamphlet in your vehicle literature 
portfolio, or contact an authorized 
Mercedes-Benz Center.
Using engine oils and oil filters of specifica-
tion other than those expressly required 
for the Maintenance System (U.S. vehi-
cles) or FSS PLUS (Canada vehicles), or 
changing of oil and oil filter at change inter-
vals longer than those called for by the 
Maintenance System (U.S. vehicles) or 
FSS PLUS (Canada vehicles) will result in 
engine damage not covered by the 
Mercedes-Benz Limited Warranty.
SLK 350 (example)1Filler capSLK 55 AMG1Filler cap
Unscrew filler cap1 from filler neck.
Add engine oil as required.
Be careful not to overfill with oil.
Be careful not to spill any oil when adding. 
Avoid environmental damage caused by oil 
entering the ground or water.
Screw filler cap1 back on filler neck.
For more information on engine oil, see 
“Technical data” (
page 449) and 
(
page 451).!Excess oil must be siphoned or drained 
off. It could cause damage to the 
engine and catalytic converter not 
covered by the Mercedes-Benz Limited 
Warranty. 
     
        
        Page 452 of 481

451 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 re-
quired for vehicles with Maintenance 
System (U.S. vehicles) or FSS PLUS (Cana-
da vehicles). For a listing of approved en-
gine oils and oil filters, refer to the Factory 
Approved Service Products pamphlet, or 
contact an authorized Mercedes-Benz 
Center.
Engine oil additives
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.Air conditioning refrigerant
R-134a (HFC) refrigerant and special 
PAG lubricating oil are used in the air con-
ditioning system. Never use R-12 (CFC) or 
mineral-based lubricating oil, otherwise 
damage to the system will occur.
Brake fluid
During vehicle operation, the boiling point 
of the brake fluid is continuously reduced 
through the absorption of moisture from 
the atmosphere.
Only brake fluid approved by 
Mercedes-Benz is recommended. Your au-
thorized Mercedes-Benz Center will pro-
vide you with additional information.
!Using engine oils and oil filters of spec-
ification other than those expressly re-
quired for the Maintenance System 
(U.S. vehicles) or FSS PLUS (Canada 
vehicles), or changing of oil and oil filter 
at change intervals longer than those 
called for by the Maintenance System 
(U.S. vehicles) or FSS PLUS (Canada 
vehicles) will result in engine damage 
not covered by the Mercedes-Benz 
Limited Warranty.
Please follow Maintenance System 
(U.S. vehicles) or FSS PLUS (Canada 
vehicles) recommendations for sched-
uled oil changes. Failure to do so will 
result in engine damage not covered by 
the Mercedes-Benz Limited Warranty.
Warning!
G
Under extremely strenuous operating condi-
tions, this moisture content can lead to the 
formation of bubbles in the system, thus re-
ducing the system’s efficiency.
Therefore, the brake fluid must be replaced 
regularly. Refer to your vehicle’s 
Maintenance Booklet for replacement 
interval. 
     
        
        Page 459 of 481

458 Technical termsCAN system
(C
ontroller A
rea N
etwork)
Data bus network serving to control ve-
hicle functions such as door locking or 
windshield wiping.
Cockpit
All instruments, switches, buttons and 
indicator/warning lamps in the passen-
ger compartment needed for vehicle 
operation and monitoring.
Cold tire inflation pressure
(
page 344)
Collapsible tire
An especially compact spare tire that 
must be inflated with a provided air 
pump before using. It should only be 
used to bring the vehicle to the nearest 
service station.COMAND*
(Co
ckpit Man
agement and 
D
ata System)
Information and operating center for 
vehicle sound and communications 
systems, including the radio, 
CD changer and navigation system, as 
well as other optional equipment (e.g. 
telephone).
Control system
The control system is used to call up 
vehicle information and to change 
component settings. Information and 
messages appear in the multifunction 
display. The driver uses the buttons on 
the multifunction steering wheel to 
navigate through the system and to ad-
just settings.
Cruise control
Driving convenience system for auto-
matically maintaining the vehicle speed 
set by the driver.Curb weight
(
page 344)
DOT
(Department o
f Transportation)
(
page 344)
Engine number
The number set by the manufacturer 
and placed on the cylinder block to 
uniquely identify each engine pro-
duced.
Engine oil viscosity
Measurement for the inner friction (vis-
cosity) of the oil at different tempera-
tures. The higher the temperature an 
oil can tolerate without becoming thin, 
or the lower the temperature it can tol-
erate without becoming viscous, the 
better the viscosity.
ESP®(Electronic S
tability Pr
ogram)
Improves vehicle handling and direc-
tional stability.