Get Maintenance and care Guide for Mercedes A Class 4 Door Third Generation (2018-2026)

Maintenance and care

257

Displaying thee service due date

On-board computer:

#

ASSYST PLUS service interval display

Always have the prescribed maintenance

work carried out at a qualiꢁed specialist

workshop.

Function off the ASSYST PLUS service interval dis-

play

4

5

Service

The next service due date is displayed.

ASSYST PLUS

The ASSYST PLUS service interval display on the

instrument display informs you of the time or dis-

tance remaining before the next service due date.

Notes on special service requireements

#

To exit the display: press the G back but-

ton on the leꢀ-hand side of the steering wheel.

The prescribed service interval is based on nor-

mal operation of the vehicle. Have the mainte-

nance work carried out more oꢀen than prescri-

bed if operating conditions are diꢂcult or the

vehicle is subject to increased stress.

You can hide this service display using the G

back button on the leꢀ-hand side of the steering

wheel.

Bear in mind the following related topic:

R

Operating the on-board computer

(/ page 207).

Depending on how the vehicle is used, the

ASSYST PLUS service interval display may shorten

the service interval, e.g. in the following cases:

The ASSYST PLUS service interval display is only

an aid. The driver of the vehicle bears responsibil-

ity as regards to whether maintenance work

needs to be performed more oꢀen than speciꢁed

based on the actual operating conditions and/or

loads.

Information on regular maintenance work

R

Mainly short-distance driving

*

NOTE Premature wear through failure to

observe service due dates

R

When the engine is oꢀen leꢀ idling for long

periods

Maintenance work which is not carried out at

the right time or incompletely can lead to

increased wear and damage to the vehicle.

R

In the event of frequent cold start phases

Examples of arduous operating conditions:

Mercedes-Benz recommends avoiding such oper-

ating conditions.

R

Regular city driving with frequent intermediate

stops

#

Adhere to the prescribed service inter-

vals.

You can obtain information concerning the servic-

ing of your vehicle from a qualiꢁed specialist

workshop, e.g. an authorized Mercedes-Benz Cen-

ter.

R

Mainly short-distance driving

R

Frequent operation in mountainous terrain or

on poor road surfaces

Maintenance and care

258

R

When the engine is oꢀen leꢀ idling for long

periods

Engine compartment

&

WARNING Risk of burns when opening the

hood

Opening and closing the hood

R

Operation in particularly dusty conditions

and/or if air-recirculation mode is frequently

used

If you open the hood in the event of an over-

heated engine or ꢁre in the engine compart-

ment, the following situations may occur:

&

WARNING Risk of accident due to driving

with the hood unlocked

In these or similar operating conditions, have the

interior air ꢁlter, air ꢁlter, engine oil and oil ꢁlter,

for example, changed more frequently. The tires

must be checked more frequently if the vehicle is

operated under increased loads. Further informa-

tion can be obtained at a qualiꢁed specialist work-

shop.

R

The hood may open and block your view.

#

You may come into contact with hot gases.

R

Never release the hood when driving.

You may come into contact with other

escaping hot operating ꢃuids.

#

Before every trip, ensure that the hood is

locked.

#

Before opening the hood, allow the

engine to cool down.

&

WARNING Risk of accident and injury

when opening and closing the hood

In the event of a ꢁre in the engine com-

partment, keep the hood closed and call

the ꢁre service.

Battery disconnection periods

The hood may suddenly drop into the end

position.

The ASSYST PLUS service interval display can cal-

culate the service due date only when the battery

is connected.

&

WARNING Risk of injury due to moving

parts

There is a risk of injury for anyone in the

hood's range of movement.

#

Do not open or close the hood if there is

a person in the hood's range of move-

ment.

Components in the engine compartment may

continue to run or start unexpectedly even

when the drive system is switched oꢄ.

Display and note down the service due date

on the instrument display before disconnect-

ing the battery (/ page 257).

Observe the following if you must open the

hood:

Maintenance and care

259

R

Electric lines to the ignition coils and the fuel

injectors

Opening the hood

#

Switch oꢄ the vehicle.

Never touch the danger zones surround-

ing moving components, e.g. the rotation

area of the fan.

&

WARNING Risk of burns from hot compo-

nent parts in the engine compartment

#

Remove jewelery and watches.

Certain component parts in the engine com-

partment can be very hot, e.g. the engine, the

cooler and parts of the exhaust system.

Keep items of clothing and hair away

from moving parts.

#

Allow the engine to cool down and only

touch component parts described in the

following.

&

WARNING Risk of injury from touching live

components

The ignition system and the fuel injection sys-

tem operate with a high voltage. You could

receive an electric shock.

&

WARNING Risk of injury from using the

windshield wipers when the hood is open

#

Never touch components of the ignition

system or fuel injection system when the

vehicle is switched on.

If the windshield wipers start moving when the

hood is open, you could be trapped by the

wiper linkage.

#

To release the hood, pull on handle 1.

#

Always switch oꢄ the windshield wipers

and the vehicle ꢁrst if you need to open

the hood.

The live components include the following, for

example:

R

Ignition coils

R

Fuel injectors

Maintenance and care

260

#

If the hood can still be liꢀed slightly, open the

hood again and close it with a little force until

it engages correctly.

On-board computer:

4

5

Service

Engine Oil Level

One of the following messages will appear on the

instrument display:

Engine oil

R

Measuring Engine Oil Level...: measurement

of the oil level is not yet possible.

Checking the engine oil level using the on-board

computer

#

Repeat the request aꢀer a maximum of

30 minutes' driving.

Requirements:

R

The engine has been warmed up.

R

Engine Oil Level OK and the bar display for

R

indicating the oil level on the instrument dis-

play is green and is between "min" and "max":

the oil level is correct.

The vehicle is parked on a level surface.

The engine is running at idle speed.

The hood is closed.

R

Engine Oil Level Add 1,1 qts. and the bar dis-

play for indicating the oil level on the instru-

ment display is orange and is below "min":

The engine oil level is determined during driving.

Determining the engine oil level can take up to

30 minutes with a normal driving style and even

longer with an active driving style.

#

Push yellow handle 1 on the hood catch to

the leꢀ as far as it will go (palm downwards).

Liꢀ the hood until it is automatically raised by

the pneumatic spring.

#

Add 1.1 US qt (1 l) of engine oil.

R

Reduce Engine Oil Level and the bar display

for indicating the oil level on the instrument

display is orange and is above "max":

Closinng the hood

#

Lower the hood and let it drop from a height of

approximately 8 in (20 cm).

Maintenance and care

261

#

Drain oꢄ any excess engine oil that has been

added. To do so, consult a qualiꢁed specialist

workshop.

&

*

WARNING Risk of ꢁre and injury from

engine oil

NOTE Damage caused by reꢁlling too

much engine oil

If engine oil comes into contact with hot com-

ponent parts in the engine compartment, it

may ignite.

Too much engine oil can damage the engine or

the catalytic converter.

R

For Engine Oil Level Switch Ignition On

#

Switch on the vehicle to check the engine oil

level.

#

Have excess engine oil removed at a

qualiꢁed specialist workshop.

#

Make sure that no engine oil is spilled

next to the ꢁller opening.

R

Engine Oil Level System Inoperative: The oil

level sensor is defective or not connected.

%

Depending on driving style, the vehicle con-

sumes up to 0.9 US qt (0.8 liter) of oil per

600 miles (1000 km). The oil consumption

may be higher than this when the vehicle is

new or if you frequently drive at high engine

speeds.

#

Allow the engine to cool oꢄ and thor-

oughly clean the engine oil from compo-

nent parts before starting the vehicle.

#

Consult a qualiꢁed specialist workshop.

R

Engine Oil Level System Currently Unavail.

#

Close the hood.

*

NOTE Engine damage caused by an incor-

rect oil ꢁlter, incorrect oil or additives

Topping up engine oil

#

Do not use engine oils or oil ꢁlters which

do not correspond to the speciꢁcations

explicitly prescribed for the service inter-

vals.

&

WARNING Risk of burns from hot compo-

nent parts in the engine compartment

Certain component parts in the engine com-

partment can be very hot, e.g. the engine, the

cooler and parts of the exhaust system.

Follow the instructions on the service

interval display for changing the engine

oil and observe the prescribed change

intervals.

#

Allow the engine to cool down and only

touch component parts described in the

following.

Do not use additives.

Maintenance and care

262

Checking the coolant level

&

WARNING Risk of burns from hot compo-

nent parts in the engine compartment

Certain component parts in the engine com-

partment can be very hot, e.g. the engine, the

cooler and parts of the exhaust system.

#

Allow the engine to cool down and only

touch component parts described in the

following.

&

WARNING Risk of scalding from hot cool-

ant

If you open the cap, you could be scalded.

#

Let the motor cool down before opening

the cap.

#

Turn cap 1 counter-clockwise and remove it.

Park the vehicle on a level surface.

#

Check the coolant temperature display in the

instrument cluster.

The coolant temperature must be in the bot-

tom quarter of the temperature display.

Add engine oil.

#

When opening the cap, wear protective

gloves and safety glasses.

Replace cap 1 and turn it clockwise until it

engages.

#

Open the cap slowly to release pressure.

#

Check the oil level again (/ page 260).

#

Slowly turn cap 1 counter-clockwise to

release overpressure.

Maintenance and care

263

#

Continue turning cap 1 counter-clockwise

and remove it.

&

WARNING ‑ Risk of ꢁre and injury from

windshield washer concentrate

The coolant level is correct in the following cases:

Windshield washer concentrate is highly ꢃam-

mable. It could ignite if it comes into contact

with hot engine component parts or the

exhaust system.

R

If the engine is cold, the coolant is up to

marker bar 2.

R

If the engine is warm, the coolant is up to

0.6 in (1.5 cm) over the marker bar 2.

#

Make sure that no windshield washer

concentrate spills out next to the ꢁller

opening.

#

If necessary, add coolant that has been

approved for Mercedes-Benz.

%

Further information on coolant (/ page 332)

Reꢁlliing the windshield washer system

&

WARNING Risk of burns from hot compo-

nent parts in the engine compartment

#

Remove cap 1 by the tab.

#

Add washer ꢃuid.

Certain component parts in the engine com-

partment can be very hot, e.g. the engine, the

cooler and parts of the exhaust system.

%

Further information about the windshield

washer ꢃuid (/ page 333)

#

Allow the engine to cool down and only

touch component parts described in the

following.

Maintenance and care

264

#

%

Keepiing the air-waterr duct free

Bring the vehicle and wheels into a suitable

position so that you can position the gauge.

To avoid an inaccurate measurement:

R

Make sure the wheels are suitably posi-

tioned.

#

Keep the area between the hood and the

windshield free of deposits, e.g. ice, snow and

leaves.

%

The positioning of gauge 3 depends on the

vehicle equipment. The gauge is positioned at

point 3, which is located either in the center

of the brakepad or at the upper end to the

side, depending on the brake caliper.

R

In the case of perforated brake discs, do

not put the measuring pin on one of the

bores in the brake disc.

Checking the brakeppad thickness

#

Switch oꢄ the engine.

Cleaning and care

Secure the vehicle against rolling away.

Notes on washing thee vehiclee in a car wash

Take the gauge out of the vehicle document

wallet in the glove box.

&

WARNING Risk of accident due to

reduced braking eꢄect aꢀer washing the

vehicle

#

Place the gauge between the wheel's spokes

in position 3 on the brakepad.

The braking eꢄect is reduced aꢀer washing

the vehicle.

Hold the gauge vertically to the brake disc and

slide measuring pin 2 onto brake disc 1.

#

Aꢀer the vehicle has been washed, brake

Check which color ꢁeld 4 the arrow on

measuring pin is pointing to.

Green: the brakepad thickness is suꢂcient.

carefully while paying attention to the

traꢂc conditions until the braking eꢄect

has been fully restored.

Red: the brakepad thickness is not suꢂcient.

Have the brakepads checked at a qualiꢁed

specialist workshop.

Maintenance and care

265

-

neutral i is engaged.

#

Ensure there is suꢂcient ground clear-

ance between the underbody and the

guide rails of the car wash.

*

NOTE Damage from automatic braking

For vehicles with automatic transmission:

If you leave the vehicle while it is being

washed, make sure the SmartKey is loca-

ted in the vehicle. The park position j is

otherwise automatically engaged.

If one of the following functions is switched

on, the vehicle brakes automatically in certain

situations:

Ensure that the clearance width of the

car wash, in particular the width of the

guide rails, is suꢂcient.

R

Active Brake Assist

R

Active Distance Assist DISTRONIC

%

If, aꢀer the car wash, you remove the wax

from the windshield and wiper rubbers, this

will prevent smearing and reduce wiper noise.

To avoid damage to your vehicle when using a car

wash, ensure the following beforehand:

R

HOLD function

R

Active Parking Assist

R

Active Distance Assist DISTRONIC is deactiva-

ted.

Automatic car wash mode

To avoid damage to the vehicle, deactivate

these systems in the following or similar situa-

tions:

In car wash mode, the vehicle is prepared for driv-

ing into the automatic car wash. Car wash mode

can be activated at a speed of up to 12 mph

(20 km/h) Activate (/ page 266) .

R

The HOLD function is switched oꢄ.

R

The surround view camera or the rear view

camera is switched oꢄ.

#

During towing

#

In a car wash

R

The side windows and sliding sunroof are com-

pletely closed.

The following settings are made when car wash

mode is activated:

*

NOTE Damage due to unsuitable car wash

R

The blower for the ventilation and heating is

switched oꢄ.

R

The outside mirrors are folded in.

#

Before driving into a car wash make sure

that the car wash is suitable for the vehi-

cle dimensions.

R

To prevent the windshield washer system from

starting up automatically, the rain sensor is

deactivated.

R

The windshield wiper switch is in position g.

R

The SmartKey is at a minimum distance of

10 ꢀ (3 m) away from the vehicle. Otherwise,

the trunk lid could open unintentionally.

R

The rear window wiper is deactivated.

The air conditioning system is set to air-recir-

culation mode.

R

For car washes with a conveyor system:

Maintenance and care

266

R

%

Parking Assist PARKTRONIC is deactivated.

Activatting/deactivating automatic car wash mode

Requirements:

R

The vehicle is stationary.

The automatic car wash mode is automatically

deactivated as soon as a speed of 12 mph

(20 km/h) is exceeded.

R

Vehicless with surround view camera: The front

image is activated aꢀer approx. eight seconds.

If one of the settings cannot be selected, this is

displayed by a % behind the respective set-

ting.

R

The engine is running.

Notes on using a power washer

Multimedia system:

4

&

WARNING Risk of an accident when using

power washers with round-spray nozzles

5

©

Settings

Quick Access

Above a speed of 12 mph (20 km/h) car wash

mode is automatically deactivated.

Activating automatiic carr wwash mode

#

The water jet can cause externally invisible

damage.

The following settings are reset when car wash

mode is deactivated:

Select Automatic Car Wash Mode.

Select Start.

#

Components damaged in this way may unex-

pectedly fail.

R

The outside mirrors are folded out.

If one of the settings cannot be selected, this is

displayed by a % behind the respective set-

ting.

R

The rain sensor is activated.

#

Do not use a power washer with round-

spray nozzles.

R

The rear window wiper is activated.

R

The air conditioning system is set to fresh air

mode.

#

Have damaged tires or chassis parts

replaced immediately.

%

For an overview of the settings made when

activating automatic car wash mode

(/ page 264).

R

Parking Assist PARKTRONIC is reset to the

previously selected setting.

To avoid damage to your vehicle, observe the fol-

lowing when using a power washer:

Deactivating automatic car wash mode

R

Vehicles with surround view camera: The front

#

Select Stop.

The automatic car wash settings are reset.

R

The SmartKey is at a minimum distance of

10 ꢀ (3 m) away from the vehicle. Otherwise,

the trunk lid could open unintentionally.

image is deactivated at speeds above 11 mph

(18 km/h).

Maintenance and care

267

R

Maintain a distance of at least 11.8 in (30 cm) Washing the vehicle by hand

to the vehicle.

Paint

R

Insect remains: soak with insect remover and

rinse oꢄ the treated areas aꢀerwards.

*

NOTE Engine damage due to water ingress

Vehicles with decorative foil: Parts of your

vehicle are covered with a decorative foil.

Maintain a distance of at least 27.6 in (70 cm)

between the foil-covered parts of the vehicle

and the nozzle of the power washer. Move the

power washer nozzle around whilst cleaning.

The water temperature of the power washer

must not exceed 140°F (60°C).

R

Bird droppings: soak with water and rinse oꢄ

aꢀerwards.

#

Take care not to point the water jet

directly towards the air inlet grille below

the hood.

Tree resin, oils, fuels and greases: remove by

rubbing gently with a cloth soaked in petro-

leum ether or lighter ꢃuid.

Observe the legal requirements, e.g. in a number

of countries, washing by hand is only permitted in

specially designated wash bays.

R

Coolant and brake ꢃuid: remove with a damp

cloth and clean water.

R

Observe the information on the correct dis-

tance in the equipment manufacturer's oper-

ating instructions.

#

Use a mild cleaning agent, e.g. car shampoo.

R

Tar stains: use tar remover.

Wax: use silicone remover.

#

Wash the vehicle with lukewarm water using a

soꢀ car sponge. When doing so, do not

expose the vehicle to direct sunlight.

Do not attach stickers, ꢁlms or similar materi-

als. Only have ꢁlm attached to the bumper at

a qualiꢁed specialist workshop.

Do not direct the nozzle of the power washer

directly at sensitive parts, such as tires, gaps,

electrical components, batteries, light sources

and ventilation slits.

#

Carefully hose the vehicle oꢄ with water and

dry using a chamois.

R

Remove dirt immediately, where possible.

%

Observe the notes on the care of vehicle

parts (/ page 269).

Matte ꢁnish

R

Only use care products approved for

Mercedes-Benz.

Notes on paintwork/matte ꢁnish paintwork care

R

Do not attach stickers, ꢁlms or similar materi-

als. Only have ꢁlm attached to the bumper at

a qualiꢁed specialist workshop.

To avoid damaging the paintwork and interfering

with the driving assistance systems, please

observe the following notes:

Maintenance and care

268

R

-

Do not polish the vehicle and alloy wheels.

Cleaning

R

For cleaning, use plenty of water and a mild

Temperature, e.g. hot air blower

Weather conditions

R

Only use car washes that correspond to the

latest engineering standards.

cleaning agent without additives or abrasive

substances, e.g. a car shampoo approved for

Mercedes-Benz.

Stone chippings and dirt

Chemical cleaning agents

Oily products

Do not use car wash program with a ꢁnal hot

wax treatment.

R

Remove dirt immediately, where possible,

whilst avoiding rubbing too hard. There is oth-

erwise a risk of damaging the decorative foil

irreparably.

Do not use paint cleaners, buꢂng or polishing

products, gloss preservers, e.g. wax.

R

Do not use polish on matte decorative foil.

Polishing will have the eꢄect of shining the

foil-wrapped surface.

In the event of paintwork damage:

If there is dirt on the ꢁnish or if the decorative

foil is dull: Use the Paint Cleaner recommen-

ded and approved for Mercedes-Benz.

R

Always have paintwork repairs carried out at a

qualiꢁed specialist workshop.

Do not treat matte or structured decorative

foils with wax. Permanent stains may occur.

R

Make sure the radar sensors function

(/ page 155).

Scratches, corrosive deposits, areas aꢄected by

corrosion and damage caused by incorrect care

cannot always be completely repaired. In such

cases, visit a qualiꢁed specialist workshop.

R

Insect remains: Soak with insect remover and

rinse oꢄ the treated areas aꢀerwards.

Bird droppings: Soak with water and rinse oꢄ

aꢀerwards.

Notes on cleaning decorative foils

You can obtain more information on care and

cleaning products from the manufacturer.

Observe the notes on matte ꢁnish care in the

chapter "Notes on paintwork/matte ꢁnish paint-

work care" (/ page 267). They also apply to

matte decorative foils.

To prevent water stains, dry a foil-wrapped

vehicle with a soꢀ, absorbent cloth aꢀer every

car wash.

In the case of foil-wrapped surfaces, optical diꢄer-

ences may occur between the surfaces that were

not protected by a decorative foil aꢀer removing a

decorative foil.

Avoiding damage to the decorative foil

R

The service life and color of decorative foils

Observe the notes on cleaning decorative foils to

avoid vehicle damage.

are impaired by:

-

Sunlight

Maintenance and care

269

R

%

Have work or repairs to decorative foils car-

ried out at a qualiꢁed specialist workshop,

e.g. in an authorized Mercedes-Benz Center.

Do not use dry cloths or abrasive or solvent-

based cleaning agents to clean the inside of

windows.

#

Always be particularly careful around the

tailpipe and the tailpipe trims and super-

vise children especially closely in this

area.

%

Aꢀer changing the wiper blades or treating

the vehicle with wax, clean the windshield

thoroughly with cleaning agents recommen-

ded for Mercedes-Benz. Failure to observe the

application instructions may result in damage,

smear marks or blinding spots.

Notes on care of vehicle parts

Allow vehicle parts to cool down before

touching them.

&

WARNING Risk of entrapment if the wind-

shield wipers are switched on while the

windshield is being cleaned

To avoid damage to the vehicle, observe the notes

on cleaning and care of the following vehicle

parts:

%

Remove external fogging or dirt on the wind-

shield in front of the multifunction camera.

Otherwise, driving systems and driving safety

systems may be impaired or not available

(/ page 155).

If the windshield wipers are set in motion

while you are cleaning the windshield or wiper

blades, you can be trapped by the wiper arm.

Wheels and rims

R

Use water and acid-free alloy wheel cleaners.

#

Always switch oꢄ the windshield wipers

and the vehicle before cleaning the wind-

shield or wiper blades.

R

Do not use acidic alloy wheel cleaners to

remove brake dust. This could damage wheel

bolts and brake components.

Wiper blades

R

Move the wiper arms into the replacement

R

To avoid corrosion of the brake discs and

position (/ page 119).

&

WARNING Risk of burns from the tailpipe

and tailpipe trims

brakepads, drive the vehicle for a few minutes

aꢀer cleaning before parking it. The brake

discs and brakepads warm up and dry out.

R

With the wiper arms folded out, clean the

wiper blades with a damp cloth.

The exhaust tailpipe and tailpipe trims can

become very hot. If you come into contact

with these parts of the vehicle, you could burn

yourself.

Windows

R

Clean the windows inside and outside with a

%

Make sure that the wiper blades are coated.

The coating can leave residues on a cloth. Do

not rub the wiper blades excessively or clean

them too oꢀen.

damp cloth and with a cleaning agent recom-

mended for Mercedes-Benz.

Maintenance and care for Your Mercedes A Class 4 Door Third Generation (2018-2026)

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