Coolants
The engine coolant is a mixture of water
and anticorrosion/antifreeze, which pro-
vides:
R
Corrosion protection
R
Freeze protection
R
Boiling protection (by increasing the
boiling point)
The cooling system was filled at the factory
with a coolant providing freeze protection
to approximately -35¦ (-37¥) and cor-
rosion protection.
!
Add premixed coolant solution only.
Adding water and MB 325.0 Anticorro-
sion/Antifreeze separately from each
other, could cause engine damage not
covered by the smart Limited Warranty.
If the antifreeze mixture is effective to
-35¦ (-37¥), the boiling point of the
coolant in the pressurized cooling system
is reached at approximately 266¦
(130¥ ).
The coolant solution must be used year
round, even in countries which have high
temperatures to provide the necessary cor-
rosion protection and increase boil‑over
protection. Refer to Maintenance/ Service
Booklet for replacement interval.
Coolant system design and coolant used
determine the replacement interval. The
replacement interval published in the
Maintenance booklet is only applicable if
MB 325.0 Anticorrosion/Antifreeze solu-
tion or other smart approved products of
equal specification are used to renew the
coolant concentration or bring it back up
to the proper level.
For information on other smart approved
products of equal specification, contact an
authorized smart center.
To provide important corrosion protec-
tion, the solution must be at least 50% anti-
corrosion/antifreeze (equivalent to freeze
protection to approximately -35¦
[-37¥]).
If you use a solution that is more than 55%
anticorrosion/antifreeze (freeze protec-
tion to approximately -49¦ [(-45¥]), the
engine temperature will increase due to
the lower heat transfer capability of the
solution. Therefore, do not use more than
this amount of anticorrosion/antifreeze.
If the coolant level is low, water and
MB 325.0 Anticorrosion/Antifreeze should
be used to bring it up to the proper level
(have cooling system checked for signs of
leakage). Please make sure the mixture is
in accordance with label instructions.
Always use anticorrosion/antifreeze that
has been approved by smart. For informa-
tion contact an authorized smart center.
The water in the cooling system must meet
minimum requirements, which are usually
satisfied by normal drinking water.
If you are not sure about the water quality,
consult an authorized smart center.
Anticorrosion/antifreeze
Your vehicle contains a number of alumi-
num parts. The use of aluminum components
in motor vehicle engines necessitates that
anticorrosion/antifreeze coolant used in
such engines be specifically formulated to
protect the aluminum parts.
Failure to use such anticorrosion/anti-
freeze coolant will result in a signifi-
cantly shortened service life.
Therefore, the following product is
strongly recommended for use in your vehi-
cle: MB 325.0 Anticorrosion/Antifreeze
agent.
Before the start of the winter season (or
once a year in hot southern regions), you
should have the anticorrosion/antifreeze
concentration checked.
The coolant is also regularly checked each
time you bring your vehicle to an author-
ized smart center for service.
Service fluids and capacities
223
>> Technical data.
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