Gas cap MERCEDES-BENZ GLS-Class SUV 2017 X166 User Guide

Fuel
Important safety notes
GWARNIN G
Fuel is highly flammable .If you handle fuel
incorrectly, there is aris kof fir eand explo-
sion .
You must avoi dfire, open flames, creating
sparks and smoking. Switc hoff th eengin e
and ,if applicable, th eauxiliary heating before
refueling.
GWARNIN G
Fuel is poisonous and hazardous to health.
Ther eis aris kof injury.
You must mak esure that fuel does no tcome
int ocontact wit hyour skin, eyes or clothing
and that it is no tswallowed. Do no tinhale fuel
vapors. Kee pfuel away from children .
If you or other scome int ocontact wit hfuel ,
observ eth efollowing:
RWash away fuel from skin immediately
usin gsoap and water.
RIf fuel comes int ocontact wit hyour eyes,
immediately rinse them thoroughly wit h
clean water. Seek medical assistanc ewith-
out delay.
RIf fuel is swallowed, seek medical assis-
tance without delay. Do no tinduce vomit -
ing .
RImmediately chang eout of clothing whic h
has come int ocontact wit hfuel .
Tank capacity
ModelTotal capa-
city
All models26.4 US gal
(100. 0l)
ModelOf which
reserv e
Mercedes ‑AMG vehiclesApprox.
3. 7US gal
(14.0 l)
Allot her modelsApprox.
3.2 US gal (12.0 l)
Gasoline
Fuel grade
!Do not use diesel to refuel vehicles with a
gasoline engine. Do not switch on the ignition
if you accidentally refuel with the wrong fuel.
Otherwise, the fuel will enter the fuel system.
Even small amounts of the wrong fuel could
result in damage to the fuel system and the
engine. Notify a qualified specialist workshop
and have the fuel tank and fuel lines drained
completely.
!Only refuel using unleaded premium grade
gasoline with at least 91 AKI/95 RON.
iE10 fuel contains up to 10% bioethanol.
Your vehicle is E10-compatible. You can
refuel your vehicle using E10 fuel.
!Only use the fuel recommended. Operating
the vehicle with other fuels can lead to dam-
age to the fuel system, engine and exhaust
system.
!Do not use the following:
RE15 (gasoline with 15% ethanol)
RE85 (gasoline with 85% ethanol)
RE100 (100% ethanol)
RM15 (gasoline with 15% methanol)
RM30 (gasoline with 30% methanol)
RM85 (gasoline with 85% methanol)
RM100 (100% methanol)
RGasoline with metalliferous additives
RDiesel
Do not mix such fuels with the fuel recom-
mended for your vehicle.
!To ensure the longevity and full perform-
ance of the engine, only premium-grade
unleaded gasoline must be used.
Service products and filling capacities379
Technical data
Z

If standard unleaded gasoline is unavailable
and you have to refuel with unleaded gasoline
of a lower grade, observe the following pre-
cautions:
ROnly fill the fuel tank to half full with regular unleaded gasoline and fill the rest with pre-
mium-grade unleaded gasoline as soon as
possible.
RDo not drive at the maximum speed.
RAvoid sudden acceleration and engine
speeds over 3,000 rpm.
You will usually find information about the fuel
grade on the pump. If you cannot find the label
on the pump, ask the staff for assistance.
iFor further information, consult a qualified
specialist workshop or visit
http://www.mbusa.com (USA only).
As a temporary measure, if the recommended
fuel is not available, you may also use regular
unleaded gasoline with an octane rating of
87 AKI/91 RON. This may reduce engine per-
formance and increase fuel consumption. Avoid
driving at full throttle and sudden acceleration.
Never refuel using gasoline with a lower AKI.
Information on refueling (
Ypage 154).
Additives
!Operating the engine with fuel additives
added later can lead to engine failure. Do not
mix fuel additives with fuel. This does not
include additives for the removal and preven-
tion of residue buildup. gasoline must only be mixed with additives recommended by
Mercedes-Benz. Comply with the instructions
for use on the product label. More information
about recommended additives can be
obtained from any authorized Mercedes-Benz Center.
Mercedes-Benz recommends that you use bran-
ded fuels that have additives.
The fuel quality available in some countries may
not be sufficient. Residue could build up in the
fuel injection system as a result. In such cases,
and in consultation with an authorized
Mercedes-Benz Center, the fuel may be mixed
with the cleaning additive recommended by
Mercedes-Benz. You must observe the notes
and mixing ratios specified on the container.
Diesel
Fuel grade
GWARNING
If you mix diesel fuel with gasoline, the flash
point is lower than that of pure diesel fuel.
When the engine is running, exhaust system
components could overheat without being
noticed. There is a risk of fire.
Never refuel with gasoline. Never mix gasoline with diesel fuel.
!Only use Ultra Low Sulfur Diesel (ULSD),
otherwise it may lead to increased wear and
damage to the fuel system, engine and
exhaust system.
!Do not use the following:
Rgasoline
Rdiesel with a bio-diesel content greater
than 5% (e.g. B20)
Rbio-diesel
Rvegetable oil
Rparaffin
Rkerosene
Rmarine diesel
Rheating oil
Do not mix such fuels with diesel fuel and do
not use any special additives. Otherwise,
engine damage may occur.
!In countries outside USA and Canada, only
use sulfur-free diesel with a sulfur content
under 50 ppm. Otherwise, the emission con-
trol system could be damaged.
You will usually find information about the fuel
grade on the pump. If you cannot find the label
on the pump, ask the staff for assistance.
Information on refueling (
Ypage 154).
Low outside temperatures
iDiesel fuel with improved cold flow proper-
ties is available during the winter months.
Further information about fuel properties can
be obtained from oil companies, e.g. at gas
stations.
380Service products and filling capacities
Technical data

DEF
Important safet ynotes
Comply wit hth eimportant safet ynote sfo rser -
vic eproducts when handlin gDE F (Ypage 378).
DE Fis awater-soluble flui dfo rth eexhaus tgas
aftertreatmen tof diesel engines. It is:
Rno tpoisonous
Rcolorles sand odorless
Rno tflammable
Whe nyou ope nth eDE Fcontainer, small
amount sof ammonia vapor may be released.
Ammoni avapor shav e a pungen todo rand are
particularly irritatin gto th eskin ,to mucous
membrane sand to th eeyes .You may experi-
ence aburning sensation in your eyes ,nose and
throat .Coughin gand watering of th eeyes are
possible.
Do no tinhale ammonia vapors. Fil lth eDE Ftank
only in well-ventilated areas.
Low outsid etemperatures
DE Ffreezes at atemperature of approximately
12 ‡(-11 †). The vehicle is delivered from th e
factory equipped wit h aDEFpreheatin gsystem.
Winte roperation can thus be guaranteed eve n
at temperature sbelo w12 ‡(-11 †).
Additives
!Only use DE Fin accordance wit hIS O
22241. Do no tuse additive swit hDE Fand do
no tdilut eDE Fwit hwater. Thi smay destroy
th eBlueTE Cexhaus tgas aftertreatmen tsys -
tem.
Purity
!Impurities in DE F(e.g. due to other servic e
products ,cleanin gagents or dust )lead to :
Rincrease demission values
Rdamage to th ecatalytic converter
Rengin edamage
Rmalfunction sin th eBlueTE Cexhaus tgas
aftertreatmen tsyste m
Assurin gth epurit yof DE Fis particularly impor -
tant wit hrespec tto avoidin gmalfunction sin th e
BlueTE Cexhaus tgas aftertreatmen tsystem.
If DE Fis pumped out of th eDE Ftank ,e.g. durin g
repair work, it mus tno tbe returned to th etank .The purit
yof th eflui dcan no longer be guaran-
teed.
Filling capacities
ModelTota lcapacity
GLS 350 d4MATIC10.2 US gal
(38.7 l)
Engin eoil
General notes
!Never use engin eoil or an oil filte rof aspec-
ification other than is necessary to fulfill th e
prescribed servic eintervals. Do no tchang e
th eengin eoil or oil filte rin order to achiev e
longer replacement intervals than those pre -
scribed. You could otherwise cause engin e
damage or damage to th eexhaus tgas after-
treatment.
Follow th einstruction sin th eservic einterval
display regardin gth eoil change. Otherwise ,
you may damage th eengin eand th eexhaus t
gas aftertreatment.
Whe nhandlin gengin eoil, observ eth eimportant
safet ynote son servic eproducts (
Ypage 378).
The engin eoils are matched to th eperformanc e
of Mercedes-Ben zengines and servic eintervals.
You should therefore only use engin eoils and oil
filters that are approved fo rvehicles wit hmain -
tenance systems .
Fo r a list of approved engin eoils and oil filters ,
consult an authorized Mercedes-Ben zCenter.
Or visit th ewebsit e
http://bevo.mercedes-benz.co m.
The table shows which engine oils have been
approved for your vehicle.
Service products and filling capacities381
Technical data
Z

Gasoline enginesMB-Freigabe orMB-Approval
All models229.5
Diesel enginesMB-Freigabe orMB-Approval
GLS 350 d 4MATIC228.51, 229.31,229.51, 229.52
Mercedes-AMG vehicles: only use SAE 0W-40
or SAE 5W-40 engine oils.
iMB approval is indicated on the oil contain-
ers.
Filling capacities
The following values refer to an oil change
including the oil filter.
ModelCapacity
GLS 350 d 4MATIC8.5 US qt (8.0 l)
GLS 550 4MATIC
Mercedes‑AMG
vehicles9.0 US qt (8.5l)
Allot her models7.4 US qt (7.0 l)
Additives
!Do not use any additives in the engine oil.
This could damage the engine.
Brake fluid
GWARNING
The brake fluid constantly absorbs moisture
from the air. This lowers the boiling point of
the brake fluid. If the boiling point of the brake
fluid is too low, vapor pockets may form in the
brake system when the brakes are applied
hard. This would impair braking efficiency.
There is a risk of an accident.
You should have the brake fluid renewed at
the specified intervals. Comply with the important safety notes for ser-
vice products when handling brake fluid
(
Ypage 378).
The brake fluid change intervals can be found in
the Maintenance Booklet.
Only use brake fluid approved by Mercedes-
Benz in accordance with MB-Freigabe or MB-
Approval 331.0.
Information about approved brake fluid can be
obtained at any qualified specialist workshop or on the Internet at
http://bevo.mercedes-benz.co m.
iHave the brake fluid regularly replaced at a
qualified specialist workshop in accordance
with the replacement intervals and the
replacement confirmed in the Maintenance
Booklet.
Coolant
Important safety notes
GWARNING
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 add anti-
freeze. Make sure that antifreeze is not spilled
next to the filler neck. Thoroughly clean the
antifreeze from components before starting
the engine.
!Only add coolant that has been premixed
with the desired antifreeze protection. You
could otherwise damage the engine.
Further information on coolants can be found
in the Mercedes-Benz Specifications for Ser-
vice Products, MB BeVo 310.1, e.g. on the
Internet at http://bevo.mercedes-benz.com.
Or contact a qualified specialist workshop.
!Always use a suitable coolant mixture, even
in countries where high temperatures prevail.
Otherwise, the engine cooling system is not
sufficiently protected from corrosion and
overheating.
iHave the coolant regularly replaced at a
qualified specialist workshop and the replace-
ment confirmed in the Maintenance Booklet.
382Service products and filling capacities
Technical data