Coolant - Mercedes-Benz 410 D Operating Instructions Manual

4.2 Coolant
Coolant is a m1 xtu10 of w,,tor ,tnd ant ,corrosion /antifreeze agent. For reasons of
corro sion protnct1011
,mcl
111
orc J cr
to raise the boiling point , the coolant mus t
remain
in
the coo hr1cJ •,y•,lt•m all year round . Renew coo lant every third year since
the anticorr os 1 on offrn
l
dtit orror ates.
Water
Water alon e 1 s not pNrrnttod to be used as coo lant, even if no antifreeze
propertie s are requrw d Wat er used as coolant must, however, meet spec ific
requirement s which
aro
often but not always met by potable water.
Sho uld the quahty of the water be insufficient , this water must be conditioned.
Any MERCED ES-81::N / se rvice station will adv ise you according ly.
Anticorrosion /antlfreeze agents
During operati on , the proportion of anticorrosion /antifreeze agent in the coo lant
must not drop below 40
%
by volume (this corresponds to antifreeze protection
to -25 ° C / -13 °F). The ant1 corrosion propert ies are no longer ensured if the
proportion is lower .
To prevent damage to the coo ling system:
- Only use an approv ed brand of anticorros ion/antifreeze agent. Any
MERCEDES-BENZ service station will advise you accordingly.
- A proportion of 50 % by volume of anticorrosion 'antifreeze agent (antifreeze
protection to -37 ° C / -35 ° F) must be ensured when replenish ing the system
(after coolant losse s).
- Never use any more than 55 % by volume (
=
maximum antifreeze protection )
of anticorrosion ,antifreeze agent. Antifreeze protection and
heat dissipation are redu ced.
53