Mercedes-Benz GL-Class 2009 Owners Manual - Manual (Page 441)

Fuels, coolants, lubricants etc.
439
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,
contact an authorized Mercedes-Benz
Center.
Anticorrosion/antifreeze
Your vehicle contains a number of aluminum
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/antifreeze coolant will
result in a significantly shortened service life.
Therefore, the following product is strongly
recommended for use in your vehicle:
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 authorized
Mercedes-Benz Center for service.
Model Approximate freeze protection
-35‡ (-37†) -49‡ (-45†)
Cooling system GL 320 BlueTEC 5.0 US qt (4.75 l) 5.5 US qt (5.2 l)
GL 450
GL 550 6.3 US qt (6.0 l) 7.0 US qt (6.6 l)
Technical data
Z