MTU 4R 1000 SERIES, Operating Instructions Manual

Page: 57 / 88

Engine oils are differentiated according to:
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engine oil brand
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quality grade (Sheet No.)
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SAE viscosity class
If, in exceptional circumstances, the type of
engine oil currently used in the engine is not
available, another mineral or synthetic engine
oil may be used. Make sure it is approved for
Mercedes-Benz.
Please observe the following: if you top up
with an engine oil of a lower quality, the main-
tenance interval corresponding to the lower
quality (Sheet No.) must be used. The main-
tenance interval is reduced. If you top up with
an engine oil of a higher quality, the mainte-
nance interval is not altered.
Observe the notes in the Maintenance Book-
let.
Coolant
G
WARNING
The engine cooling system is under pressure,
particularly if the engine is warm. You could
be scalded by hot coolant spraying out when
opening the cap. There is a danger of injury.
Allow the engine to cool before opening the
cap. Wear gloves and protective eyewear
when opening. Slowly turn the cap half a turn
to allow pressure to escape.
G
WARNING
If antifreeze comes into contact with hot com-
ponents in the engine compartment, it may
ignite. There is a risk of fire and injury.
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.
The corrosion inhibitor/antifreeze in the cool-
ant has the following properties:
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heat transfer
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anti-corrosion protection
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cavitation protection (protection against
pitting)
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antifreeze protection
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raising the boiling point
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.
Renew the coolant at the interval specified in
the Maintenance Booklet.
Only use approved corrosion inhibitor/anti-
freeze agents (
Y
page 81). Please note the
Mercedes-Benz Specifications for Service
Products (
Y
page 53). This prevents damage
to the engine cooling system and engine.
When renewing the coolant, ensure that it
contains 50% corrosion inhibitor/antifreeze
by volume. This corresponds to antifreeze
protection down to
Ò
37 †.
Do not exceed 55% by volume (antifreeze
down to approximately
Ò
45 †). The heat dis-
sipation and antifreeze may otherwise be
negatively affected.
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.
Please note the Mercedes-Benz Specifica-
tions for Service Products, Sheet No. 310.1.
Mixtures with other corrosion inhibitors/anti-
freeze agents are not permitted.
Service products
55
Maintenance
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