General Notes - Mercedes-Benz Unimog Operating Instructions Manual

Let the engine cool down before you top up
the antifreeze. Make sure that antifreeze is
not spilled next to the filler neck. Thoroughly
clean the antifreeze from components before
starting the engine.
A coolant that ensures anti-corrosion/anti-
freeze protection and other important pro-
tective effects is filled at the factory.
The coolant is a mixture of water and corro-
sion inhibitor/antifreeze agent.
The corrosion inhibitor/antifreeze in the cool-
ant has the following properties:
heat transfer
R
anti-corrosion protection
R
cavitation protection (against pitting)
R
antifreeze protection
R
raising the boiling point
R
Leave the coolant in the engine cooling sys-
tem all year round – even in countries with
high outside temperatures.
Check the corrosion inhibitor/antifreeze con-
centration in the coolant every six months.
Have the coolant replaced regularly at a quali-
fied specialist workshop. You can find the
intervals for coolant change in the mainte-
nance booklet.
Only use corrosion inhibitor/antifreeze
approved by Mercedes-Benz, according to
Sheet No. 325.5 or 326.5. This prevents dam-
age to the engine cooling system and engine.
Information about approved corrosion inhibi-
tor/antifreeze additive can be obtained from
a qualified specialist workshop or on the
Internet at http://bevo.mercedes-
benz.com.
When renewing the coolant, ensure that it
contains 50% corrosion inhibitor/antifreeze
by volume. This corresponds to antifreeze
protection down to Ò37 †.
Do not exceed 55% by volume (antifreeze
down to approximately Ò45 †). The heat dis-
sipation and antifreeze may otherwise be
negatively affected.
Service products
If there is a loss of coolant, do not top it up by
using only water, but also add an approved
corrosion inhibitor/antifreeze agent.
The water in the coolant must meet certain
requirements, which are often fulfilled by the
use of drinking water. The water must be
treated if its quality does not meet the
required standards.
Observe the Mercedes-Benz Specifications
for Service Products, Sheet No. 310.1.
Further information can be obtained from a
Mercedes-Benz Service Centre.
Hydraulic fluids

General notes

H
Environmental note
Mixing different oil types can affect opera-
tional effectiveness and biodegradability to an
impermissible degree.
The hydraulic system is filled with SAE 10 W
engine oil as standard at the factory.
At low outside temperatures down to Ò32 †
you can use SAE 5 W-40 engine oil.
Always use the same grade of hydraulic fluid
for the hydraulic system and the attached
equipment/assemblies.
If you change grades of hydraulic fluid, the
entire hydraulic system must be fully emptied
first. This includes hoses, valves, cylinders
and oil filters. In addition, the attached equip-
ment and assemblies must also be emptied.
Otherwise, the hydraulic fluid may foam at a
mixing ratio higher than 3%.
Have the hydraulic fluid replaced regularly at
a qualified specialist workshop. You can find
the intervals for hydraulic fluid change in the
maintenance booklet.
Only use hydraulic fluids approved by
Mercedes-Benz, according to MB Approval
228.0. Information about approved hydraulic
fluid can be obtained from a qualified spe-
cialist workshop or on the Internet at http://
bevo.mercedes-benz.com.
363
Z