Mercedes-Benz 2009 M-Class Operator's Manual page 246

Operation
Engine compartment
The coolant level is correct if the level
for cold coolant: reaches marking bar
R
in expansion tank
1 3
for warm coolant: is approximately 0.6 in
R
(1.5 cm) higher
X
Add coolant as required.
X
Replace and tighten cap 2.
For more information on coolant, see the
"Technical data" section ( Y page 418) and
( Y page 412).
Washer system and headlamp
cleaning system
G Warning!
Washer solvent/antifreeze is highly
flammable. Do not spill washer solvent/
antifreeze on hot engine parts, because it
may ignite and burn. You could be seriously
burned.
! Always use washer solvent/antifreeze
where temperatures may fall below
freezing point. Failure to do so could result
in damage to the washer system/fluid
reservoir.
244
! Only use washer fluid which is suitable for
plastic lenses. Improper washer fluid can
damage the plastic lenses of the
headlamps.
! Do not use distilled or de-ionized water in
the washer fluid reservoir. Otherwise, the
washer fluid level sensor could be
damaged.
Cap for washer fluid reservoir
1
Fluid for the washer system, rear window
washer system and the headlamp cleaning
system is supplied from the washer fluid
reservoir.
During all seasons, add MB Windshield
Washer Concentrate "MB SummerFit" to
water. Premix the washer fluid in a suitable
container.
X
Opening washer fluid reservoir: Pull tab
of cap upwards.
1
X
Refill the washer fluid reservoir with MB
Windshield Washer Concentrate "MB
SummerFit" and water (or commercially
available premixed washer solvent/
antifreeze, depending on ambient
temperatures) ( Y page 419).
X
Closing washer fluid reservoir: Press cap
onto filler hole until it engages.
1
For more information, see "Washer system
and headlamp cleaning
system" ( Y page 413).