MERCEDES-BENZ C CLASS COUPE 2023 Owners Manual

\bVehicles with a tire pressure loss warning sys-tem: if an emergency spare wheel is installed,
the tire pressure loss warning system cannot function reliably. Only restart the system
again when the emergency spare wheel has been replaced with a new wheel.
Vehicles with a tire pressure monitoring sys-
tem: if an emergency spare wheel is installed,
the tire pressure monitoring system cannot
function reliably. For a few minutes aser an
emergency spare wheel is installed, the sys- tem may still display the tire pressure of the
removed wheel. Only restart the system again when the emergency spare wheel has been
replaced with a new wheel.
Be sure to also observe the following further rela-
ted subjects:
= Notes on tire pressure (  page 340)
= Tire and Loading Information placard
(  page 347)
= Tire pressure table (  page 342)
= Notes on installing tires (  page 358)
= installing an emergency spare wheel
(  page 362)
Wheels and tires369

Notes on technical data*NOTE Mercedes-AMG vehiclesObserve the notes in the Supplement.
You could otherwise fail to recognize
dangers.
The data stated only applies to vehicles with standard equipment. You can obtain further infor-
mation from an authorized Mercedes-Benz Cen-
ter.
Vehicle electronics
Two-way radios

q Notes on installing two-way radios
&WARNING Risk of accident due to
improper work on two-way radios
If two-way radios are manipulated or retroNt-
ted incorrectly, the electromagnetic radiation
from the two-way radios can interfere with the vehicle electronics and jeopardize the operat-
ing safety of the vehicle.
You should have all work on electrical
and electronic components carried out
at a qualiNed specialist workshop.&WARNING Risk of accident due to
improper operation of two-way radios
If you use two-way radios in the vehicle
improperly, their electromagnetic radiation
can disrupt the vehicle\bs electronics. This is
the case in the following situations, in particu-
lar:
= The two-way radio is not connected to an
exterior antenna.
= The exterior antenna is installed incor-
rectly or is not a low-reOection antenna.
This could jeopardize the operating safety of
the vehicle.
Have the low-reOection exterior antenna
installed at a qualiNed specialist work-
shop.When operating two-way radios in the
vehicle, always connect them to the low-
reOection exterior antenna.*NOTE Invalidation of the operating permit
due to failure to comply with the instruc-
tions for installation and use
The operating permit may be invalidated if the instructions for installation and use of two-wayradios are not observed.
Only use approved frequency bands.Observe the maximum permissible out-put power in these frequency bands.Only use approved antenna positions.370Technical data

1Rear roof area
On vehicles with a panorama roof with power tilt/
sliding panel, installing an antenna to the roof area is not permitted.
Use Technical SpeciNcation ISO/TS 21609 (Road
Vehicles !

Regulatory radio identiNcation and notes
Regulatory radio identiNcation of small compo-
nents
Manufacturer information about radio-based vehi-
cle components can be found using the key phrase "Regulatory radio identiNcation in the Dig-
ital Operator\bs Manual in the vehicle, on the inter-
net and in the app.
Regulatory radio identiNcation !

Vehicle identiNcation plate (USA only)1Maximum permissible gross vehicle weight2Maximum permissible front axle load3Maximum permissible rear axle load4Paint code5VIN (vehicle identiNcation number)Vehicle identiNcation plate (Canada only)1Maximum permissible gross vehicle weight2Maximum permissible front axle load3Maximum permissible rear axle load4Paint code5VIN (vehicle identiNcation number)
The maximum permissible gross vehicle weight is
made up of the vehicle weight, all vehicle occu-
pants, the fuel and the load. The maximum gross
axle weight rating is the maximum weight that can be carried on one axle (front!

Additional plates1Plate with information about emissions test-
ing, including conNrmation of emissions
guidelines at the U.S. federal level as well as
for California2Engine number stamped into the crankcase3VIN (vehicle identiNcation number) as a label
at the lower edge of the windshieldOperating Ouids
Notes on operating Ouids
*NOTE Mercedes-AMG vehiclesObserve the notes in the Supplement.
You could otherwise fail to recognize
dangers.&WARNING Risk of injury due to harmful
operating Ouids
Operating Ouids can be toxic.
When using, storing and disposing of
operating Ouids, observe the imprints on
the respective original containers.Always keep operating Ouids in the
sealed original container.Always keep children away from operat-
ing Ouids.+ENVIRONMENTAL NOTE Pollution of the
environment due to irresponsible disposal
of operating Ouids
Incorrect disposal of operating Ouids can
cause considerable damage to the environ- ment.
Dispose of operating Ouids in an environ-
mentally responsible manner.
Operating Ouids include the following:
= Fuels
= Lubricants
= Coolant
= Brake Ouid
= Windshield washer Ouid
= Climate control system refrigerant
Only use products approved by Mercedes-Benz.
Damage caused by the use of products that have not been approved is not covered by the
Mercedes-Benz warranty or goodwill gestures.
374Technical data

The operating Ouids approved by Mercedes-Benz
can be identiNed by the following inscriptions on
the container:
= MB-Freigabe (e.g. MB-Freigabe 229.51)
= MB-Approval (e.g. MB-Approval 229.51)
Further information on approved operating Ouids:
= in the Mercedes-Benz SpeciNcations for Oper-
ating Fluids by entering the designation
- At https://operatingOuids.mercedes-
benz.com
= At a qualiNed specialist workshop&WARNING Risk of Nre or explosion from
fuel
Fuels are highly Oammable.
Fire, open Oames, smoking and creating
sparks must be avoided.Before and during refueling, switch oM
the vehicle and, if installed, the station- ary heater.&WARNING Risk of injury from fuels
Fuels are poisonous and hazardous to your
health.
Do not swallow fuel or let it come into
contact with skin, eyes or clothing.Do not inhale fuel vapor.Keep children away from fuel.Keep doors and windows closed during
the refueling process.
If you or other people come into contact with
fuel, observe the following:
Immediately rinse fuel oM your skin with
soap and water.If fuel comes into contact with your eyes, immediately rinse them thoroughly with
clean water. Seek medical attention
immediately.If you swallow fuel, seek medical atten-
tion immediately. Do not induce vomit-
ing.Change immediately out of clothing that has come into contact with fuel.Flexible-fuel vehicles can be refueled with the fol-lowing fuel types:
= premium-grade unleaded gasoline
= E85 fuel
= a mixture of E85 fuel and premium-grade
unleaded gasoline
Flexible-fuel vehicles can be identiNed by the
Ethanol up to E85 sticker on the inside of the fuel
Nller Oap.
Depending on the country, the fuels you can use in your vehicle may diMer from the information in
the Operator\bs Manual. The fuels that have been
approved for your vehicle can be found on the
instruction label on the inside of the fuel Nller Oap.Technical data375

Fuel

qInformation on fuel quality for vehicles with gas-
oline engines
Observe the notes on operating Ouids
(  page 374).
*NOTE Damage caused by the wrong fuel
Even small amounts of the wrong fuel could
result in damage to the fuel system, the
engine and the emission control system.
Only refuel with low-sulfur spark-ignition
engine fuel.
This fuel may contain up to 10% ethanol by vol- ume. Your vehicle is suitable for use with E10 fuel.
Never refuel with one of the following fuels: = diesel
= Gasoline with more than 10% ethanol by
volume, e.g. E15, E85, E100
= Gasoline with more than 3% methanol by
volume, e.g. M15, M30, M85, M100
= Gasoline with additives containing metal
If you have accidentally refueled with the
wrong fuel:Do not switch on the vehicle.Consult a qualiNed specialist workshop.
If the available fuel is not suPciently low in sulfur,
it may produce unpleasant odors.
Only refuel with fuel that has at least the octane number speciNed in the information label in the
fuel Nller Oap ( page 168).
For maximum engine output: Only refuel using
premium-grade gasoline with at least 91 AKI/
95 RON.
If the recommended fuel is not available, you may also temporarily use regular gasoline with anoctane number of at least 87 AKI/91 RON. Thismay reduce engine output and increase fuel con-
sumption.
Never refuel using gasoline with an even lower
RON.
*NOTE Premature engine wear through
unleaded regular gasoline
Impairment of the longevity and performance
of the engine.
If unleaded premium grade gasoline is unavail- able and you have to refuel using unleaded
regular gasoline:
Only Nll the fuel tank to half full with
unleaded regular gasoline and reNll as
soon as possible with unleaded premium
grade gasoline.Do not drive at the maximum design speed.Avoid sudden acceleration and engine
speeds over 3000 rpm.
Further information on fuel is available at the fol- lowing locations:
= At a gas station
= At a qualiNed specialist workshop
= USA only: On the https://www.mbusa.com
376Technical data

qInformation on additives in gasoline (vehicles
with gasoline engine)
Observe the notes on operating Ouids
(  page 374).*NOTE Damage from use of unsuitable
additives
Even small amounts of the wrong additive may
lead to malfunctions occurring.
Only add cleaning additives recommen-
ded by Mercedes-Benz to the fuel.
Mercedes-Benz recommends that you use brand-
name fuels with additives.
In some countries, the fuel available may not have
suPcient additives. Deposits could build up in the
fuel injection system as a result. In this case, in consultation with a Mercedes-Benz Service Cen-ter, mix the fuel with the cleaning additive recom-
mended by Mercedes-Benz. Observe the notes and mixing ratios indicated on the tank.

q Tank content and fuel reserve
Total fuel tank capacityModelAll models17.4 gal (66.0 l)
Reserve fuel tank
ModelAll models1.9 gal (7.0 l)
Engine oil

q Notes on engine oil
Observe the notes on operating Ouids
(  page 374).
*NOTE Engine damage caused by an incor-
rect oil Nlter, incorrect oil or additivesDo not use engine oils or oil Nlters other
than those which meet the speciNcations
necessary for the prescribed service
intervals.Do not alter the engine oil or oil Nlter in
order to achieve longer change intervals than prescribed.Do not use additives.Have the engine oil changed aser the
prescribed intervals.Technical data377

Mercedes-Benz recommends having the oil
changed at a qualiNed specialist workshop.
Only use engine oils approved for your vehicle by
Mercedes-Benz.

q Engine oil quality and Nlling capacity
Engine oil speciNcationModelMB-Freigabe or MB-
ApprovalAll models229.71, 229.72 1)1) Recommended for lowest possible fuel consumption (lowest SAE
viscosity class in each case; observe possible restrictions of the
approved SAE viscosity classes)
Use only SAE 0W-20 viscosity class engine oils.
To achieve the lowest possible fuel consumption, it is recommended to use the engine oil speciNca-
tions marked in the table for the lowest SAE vis-
cosity class. While doing so, observe possible
restrictions of the approved SAE viscosity classes.
Engine oil Nlling capacityModelCapacityAll models6.3 US qt (6.0 liters)
The speciNed Nlling capacity refers to an oil
change with the oil Nlter.
Notes on brake Ouid
Observe the notes on operating Ouids
(  page 374).
&WARNING Risk of an accident due to
vapor pockets forming in the brake system
The brake Ouid constantly absorbs moisture
from the air. This lowers the boiling point of
the brake Ouid. If the boiling point is too low,
vapor pockets may form in the brake system when the brakes are applied hard.
This causes the braking eMect to be impaired.
Have the brake Ouid renewed at the
speciNed intervals.Have the brake Ouid regularly replaced at a quali-
Ned specialist workshop.
Only use a brake Ouid approved by Mercedes-
Benz according to MB-Freigabe or MB-Approval 331.0.
Coolant

q Notes on coolant
Observe the notes on operating Ouids
(  page 374).
&WARNING !