Mercedes-Benz Zetros 2020 Operating Instructions Manual page 149

Adding/topping up the engine oil
! There is a risk of damage to the catalytic
converter or to the engine if too much oil is
added. Have excess oil drained off.
When topping up, Mercedes-Benz recom-
mends that you only use engine oil of the
same grade and SAE class as the oil filled at
the last oil change.
Check the oil level in the on-board computer
Y
( page 78) before you top up the oil.
You will find more information on topping up
the engine oil in the "Maintenance" section
Y
( page 164).
Miscibility of engine oils
The benefits of high-quality engine oils are
diminished if you mix them.
Engine oils are differentiated according to:
engine oil brand
R
quality grade (Sheet No.)
R
SAE viscosity class
R
If, in exceptional circumstances, the type of
engine oil currently used is not available,
another engine oil approved for Mercedes-
Benz may be used.
Setting the oil grade
! If the on-board computer shows the 4
symbol and you top up with the quantity of
oil displayed in the on-board computer, note
the following:
If you top up with an engine oil of a lower
R
quality, set the lower quality (Sheet no.) in
the on-board computer.
If you top up with an engine oil of a higher
R
quality, do not set the higher quality
(Sheet no.) in the on-board computer.
X
Set the Sheet No. (quality grade) of the
engine oil in the on-board computer
Y
( page 80).
Transmission oils
General notes
At the factory, drive axles, transmission and
the PTO shaft gear are filled with a high-quality
synthetic oil.
The planetary axles are filled with mineral oil.
! When changing the oil, if you replace the
synthetic oil with a mineral transmission oil,
you may damage the assembly. Before the
oil change, check whether the use of a min-
eral transmission oil is permitted. Informa-
tion is available from any Mercedes-Benz
Service Centre.
Transmission oil grade
The quality grade (Sheet No.) of the transmis-
sion oil used can be checked in the on-board
Y
computer ( page 80).
Coolant
G
WARNING
If antifreeze comes into contact with hot
components 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 protec-
tive effects is added 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:
heat transfer
R
anti-corrosion protection
R
cavitation protection (protection against pit-
R
ting)
antifreeze protection
R
raising the boiling point
R
Leave the coolant/antifreeze in the engine
cooling system all year round – even in coun-
tries with high outside temperatures.
Check the corrosion inhibitor/antifreeze con-
centration in the coolant every six months.
Only use approved corrosion inhibitors/anti-
freeze agents in accordance with Sheet No.
325.5. This prevents damage to the engine
cooling system and engine.
Operating fluids
Z
147