Service fluids and capacities
>> Technical data.
309 Coolants
The engine coolant is a mixture of water and
anticorrosion/antifreeze, which provides:
• Corrosion protection
• Freeze protection
• Boiling protection (by increasing the
boiling point)
The cooling system was filled at the factory
with a coolant providing freeze protection to
approximately 35°F (37°C) and corrosion
protection.!
Add premixed coolant solution only.
Adding water and MB 325.0 Anticorrosion/An
tifreeze separately from each other, could
cause engine damage not covered by the
smart Limited Warranty.
If the antifreeze mixture is effective to 35°F
(37°C), the boiling point of the coolant in the
pressurized cooling system is reached at
approximately 266°F (130°C).The coolant solution must be used year round,
even in countries which have high tempera
tures to provide the necessary corrosion
protection and increase boiling protection.
Refer to Maintenance/ Service Booklet for re
placement interval.
Coolant system design and coolant used
determine the replacement interval. The
replacement interval published in the Mainte
nance booklet is only applicable if MB 325.0
Anticorrosion/Antifreeze solution or other
smart approved products of equal specifica
tion are used to renew the coolant concentra
tion 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 protection,
the solution must be at least 50% anticorro
sion/antifreeze (equivalent to freeze protec
tion to approximately 35°F [37°C]).If you use a solution that is more than 55%
anticorrosion/antifreeze (freeze protection
to approximately 49°F [45°C]), 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 have
been approved by smart. For information
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.
