Mercedes-Benz GLS Operator's Manual page 391

DEF
Important safety notes
Comply with the important safety notes for ser-
vice products when handling DEF (
DEF is a water-soluble fluid for the exhaust gas
aftertreatment of diesel engines. It is:
not poisonous
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colorless and odorless
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not flammable
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When you open the DEF container, small
amounts of ammonia vapor may be released.
Ammonia vapors have a pungent odor and are
particularly irritating to the skin, to mucous
membranes and to the eyes. You may experi-
ence a burning sensation in your eyes, nose and
throat. Coughing and watering of the eyes are
possible.
Do not inhale ammonia vapors. Fill the DEF tank
only in well-ventilated areas.
Low outside temperatures
DEF freezes at a temperature of approximately
12 ‡ (-11 †). The vehicle is delivered from the
factory equipped with a DEF preheating system.
Winter operation can thus be guaranteed even
at temperatures below 12 ‡ (-11 †).
Additives
!
Only use DEF in accordance with ISO
22241. Do not use additives with DEF and do
not dilute DEF with water. This may destroy
the BlueTEC exhaust gas aftertreatment sys-
tem.
Purity
!
Impurities in DEF (e.g. due to other service
products, cleaning agents or dust) lead to:
increased emission values
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damage to the catalytic converter
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engine damage
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malfunctions in the BlueTEC exhaust gas
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aftertreatment system
Assuring the purity of DEF is particularly impor-
tant with respect to avoiding malfunctions in the
BlueTEC exhaust gas aftertreatment system.
If DEF is pumped out of the DEF tank, e.g. during
repair work, it must not be returned to the tank.
Service products and filling capacities
The purity of the fluid can no longer be guaran-
teed.
Filling capacities
page 386).
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Model
GLS 350 d 4MATIC
Engine oil
General notes
!
Do not use engine oil or an oil filter with
specifications deviating from those expressly
required for the prescribed service intervals.
Do not change the engine oil or oil filter in
order to set replacement intervals longer than
those prescribed. This could otherwise cause
damage to the engine or exhaust gas after-
treatment.
Follow the instructions on the service interval
display for changing the engine oil. This could
otherwise cause damage to the engine or
exhaust gas aftertreatment.
When handling engine oil, observe the important
safety notes on service products (
The engine oils are matched to the performance
of Mercedes-Benz engines and service intervals.
You should therefore only use engine oils and oil
filters that are approved for vehicles with main-
tenance systems.
For a list of approved engine oils and oil filters,
consult an authorized Mercedes-Benz Center.
Alternatively, visit the website
http://bevo.mercedes-benz.com.
The table shows which engine oils have been
approved for your vehicle.
389
Total capacity
10.2 US gal
(38.7 l)
page 386).
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