coolant AUDI Q7 2015 Owner´s Manual

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-Apply the parking brake.
- Move selector lever to P (Park).
- Always let the engine cool down. Hot
components will burn skin on contact.
- To reduce the risk of being burned, never
open the hood if you see or hear steam
or coolant escaping from the engine
compartment. Wait until no steam or
coolant can be seen or heard before care­
fully opening the hood.
- Keep children away from the engine com­
partment .
- Never spill fluids on hot engine compo­
nents. They can cause a fire.
- Never touch the radiator fan. The auxili­
ary electric fan is temperature controlled
and can switch on suddenly.
- Never open the coolant reservoir cap
when the engine is still warm. The cool­
ant system is pressurized and hot cool­
ant could spray out .
- Protect your face, hands and arm from
steam or hot engine coolant by placing a
thick rag over the cap when you open the
coolant reservoir .
- Do not remove the engine cover under
any circumstances . This increases the
risk of burns.
- If work on the fuel system or the electri­
cal system is necessary:
- Always disconnect the battery .
- Never smoke or work near heaters or
open flames. Fluids in the engine com­
partment could start a fire.
- Keep an approved fire extinguisher im­
mediately available.
- To avoid electrical shock and personal in­
jury while the engine is running or being
started, never touch:
- Ignition cables
- Other components of the high voltage
electronic ignition system.
- If you must perform a check or repair
with the engine running:
Checking and filling 257
- First, fully apply the parking brake,
move selector lever to P (Park).
- Always use extreme caution to prevent
clothing, jewelry, or long hair from get­
ting caught in the radiator fan, V-belts
or other moving parts, or from contact­
ing hot parts . Tie back hair before
starting, and do not wear clothing that
will hang or droop into the engine.
- Minimize exposure to emission and
chemical hazards~&. .
A WARNING
California Proposition 65 Warning:
- Engine exhaust, some of its constituents,
and certain vehicle components contain
or emit chemicals known to the State of
California to cause cancer and birth de­
fects and reproductive harm. In addition,
certain fluids contained in vehicles and
certain products of component wear con­
tain or emit chemicals known to the State of California to cause cancer and
birth defects or other reproductive harm.
- Battery posts, terminals and related ac­
cessories contain lead and lead com­
pounds, chemicals known to the State of
California to cause cancer and reproduc­
tive harms. Wash hands after handling.
Q) Note
When adding fluids, always make sure that
they are poured into the proper container
or filler opening, otherwise serious dam­
age to vehicle systems will occur .
@ For the sake of the environment
To detect leaks in time, inspect the vehicle
floor pan from underneath regularly . If
you see spots from oil or other vehicle flu­ ids, have your vehicle inspected by an au­
thorized Audi dealer. •
•

258 Checking and filling Engine compartment
These are the most important items that you can check .
Fig. 242 Typical layo ut for containers, engine oil di pstick and engin e oil fille r cap
(D W indshield/head light washer
t . (
;R ) con ainer ,.... .............. .
@ Coolant expansion tank (-L) .. .
@ Engin e oi l filler cap ('t".:r.) . .. .. .
©
®
®
(j)
Eng ine oil dipstick .......... .
Brake fluid reservoir
((0)) ..... .
Power steering reservoir ... .. .
Jump start connector( +) under 270
263
261
260
265
226
a cover,( ·) with hex head screw 268,317
The position of the engine o il fi lling hole and
the engine oil dipstick
r=;, fig. 242 (position ®
and @) can vary according to the type of en­
gine .
_&. WARNING
Before you check anything in the engine
compartment, always read and heed all
WARNINGS ¢.&.
in Working in the engine
c ompartment on page 256.
-
Engine oil
Engine oil specifications
The engine oil used must conform to exact
specifications .
The service interva l disp lay in t he instrument
cluster of your vehicle will inform you when it
is time for an oil change . We recommend that
you have your oil changed by an authorized Audi Service Advisor.
If you have to top
off the oil between oil
changes, use the Audi o il quality standard
spec ified in the table.
Audi oil quality standard
Gasoline
VW 502 00 or
engine vw 504 00
Diesel vw 507 00
engine

26 2 Ch eck ing and filling
8_ WARNING
Stop! Before working in the engine com­
partment, always read and heed all WARN ­
INGS
~ .&. in Working in the engine com­
partment on page
256 . The engine com­
partment of any motor veh icle is a poten­
tially dangerous area and can cause ser i­
ous personal injury.
8_ WARNING ,,,__
If you must change the engine oil in your
vehicle:
- Always wea r eye protection .
- T o reduce the ris k of burns from hot en-
gine oil let the engine cool down to the
touch.
- Whe n removing the oil drain plug with
yo ur fingers, stay as far away as poss ible.
Always keep your forearm paralle l to the
ground to he lp prevent hot oil from run­
ning down your arm.
- Drain the oi l into a container designed
for this pu rpose, one large enough to
hold at least the total amount of oil in
your engine.
- To reduce the risk of poisoning, never use
empty food or beverage containers that
might m islead someone into dr ink ing
from them.
- Engine oil is poisonous. Keep it well out
of the reach of children.
- Cont inuous contact with used engine oil
is harmful to your skin. Always protect
your sk in by washing thoroughly with
soap and water .
(D Note
Never mix oil additives with your engine
oil. These additives can damage your en­
gine and adverse ly affect your Audi Limit­
ed New Vehicle Warranty.
@i For the sake of the environment
- Before changing the oil, first make sure
you know where you can properly dispose of the old oil.
-
.
- Always dispose of used oil p roperly. Nev ­
er dump it on garden soil, in wooded
areas, into st reams or down sewage
dra ins.
- Recycle used oi l by taking it to a used en­
gine oil collection facility in your area, or
contact a service station.
- We strongly recommend that yo u have
your oil changed by an authorized Audi
dealer or a qualified workshop with the
special tools and expert ise required, and
proper means of disposal.
Engine cooling system
Coolant
The engine coolant performs two functions: it
keeps the engine from overheating and it pro­
tects the engine from freezing in the winter.
T he cooling sys tem is sealed and genera lly re­
quires little attention.
The cooling system has been fi lled at the fac­
tory with a permanent coolant which does not need to be changed. The coo lant cons ists of a
mixtu re of specially conditioned water and the
manufacturer's g lycol -basedcoo la nt add
i-
tive G l3 antifreeze with anticorrosion addi ­
tives (SO% for USA mode ls; 60% for Canadian
models). This mixture both assures the neces­
sary frost protection and protects metal com­
ponents in the eng ine's cooling system from
corros ion and scaling.
It also ra ises the bo il­
i ng po int of the coolant .
Do not reduce the concentration of the cool­
ant in the summer by adding p lain wate r. Th e
proportion of coo lant additiv e mu st be at
l e as t 50 °/4 but not m ore than 60°/4
to main­
ta in ant ifreeze protect io n and cooling eff ic ien­
c y.
If the coo lant fros t protection is too low,
the coolant could freeze and damage the vehi­
cle heating and engine cooling system.
For year- round driving, antifreeze is added at
t h e factory fo r temperatures down to:
- -31°F(-35°C)USA
- - 40 °F ( - 40 °C) Canada.

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If you must add coolant, use a mixture of wa­
ter and coolant additive. Mixing the coolant
addit ive with distilled water is recommended .
.&_ WARNING
Before you check anything in the engine
compartment, always read and heed all
WARNINGS
¢ .&. in Working in the engine
compartment on page 256 .
(D Note
-Before winter sets in, have the coolant
checked to see if the coolant additive in
your vehicle is suffic ient to meet the cli ­
mate cond itions . Th is is especially impor­
tant if you live in a region where the w in­
te r is extremely cold. If necessary, in­
crease the proport ion of coolant additive
to 60% .
- When adding coolan t addi tive to you r
cooling system , remember:
- We recommend using only coolant ad­ ditive G12 ++ or G13 for your vehicle.
This coo lant additive is available at au­
thorized Aud i dealers . Other types of
antifreeze can significantly reduce cor­
rosion protection . Th e resu lting co rro­
sion c an cause a loss of coo la nt and se­
r ious engine damage.
- Do not add a ny type of radiator leak sea l­
ant to your veh icle's engine coo lant.
Adding rad iator repair fluid may adverse ­
l y affect the function and performance of
your cooling system and could result in damage not covered by your New Vehicle Limited Warranty.
-
Checkin g and fillin g 263
Checking the engine coolant level
The engine coolant level can be checked with
a quick glance .
F ig . 2 4 6 En gin e compar tmen t: Coolant expan sio n ta nk
Befo re you check anyth ing in the eng ine com ­
partment,
alw ays r ead and he ed all WARN­
INGS ¢ A in Working in the engine comport­
ment on page 256 .
.,.. Park your vehicle on a level su rface.
.,.. Tu rn
off t he ignition .
.,.. Let the engine cool down.
.,.. Plac e a thick rag over the coolant expans ion
tank ¢
fig. 246, ¢ page 258, fig. 242 and
carefull y twist the cap counter-clockwise
¢_&. .
.,.. Read the engine coolant level in the open
coo lant expansion tank. W it h a co ld eng ine,
the coolant leve l should be between the
"min " and "max" markings. W hen the en­
gi ne is wa rm, the level may be slightly above
t he "max" marking.
T he location of the coo lant expansion tank
can be seen in the engi ne compa rtment illus­
trat ion
¢ page 258 .
To obtain an accu rate reading, the engine
must be switched off.
The expansion ta nk in your vehicle i s equ ipped
with an electric coolant level sensor .
When the coolant leve l is too low, the warning
light i n the Auto-Check System¢
page 32 will
blink unti l you add coolant and the level has
been restored to normal. Even though there is
an electric coo lant level senso r, we still rec­
ommend you check the coolant level from
t ime to t ime .

264 Check ing and filling
Coolant lo ss
Coolant loss may indicate a l ea k in t he cooling
system. In the event of coolant loss, the cool ­
ing system should be inspected immediately
by your authorized Audi dealer. It is not
enough merely to add coolant.
I n a
se ale d system, losses can occur only if
the boiling point of the coolant is exceeded as
a result of overheating.
A WARNING
The cooling system is under pressure and
can get very hot. Reduce the risk of scald­
ing from hot coolant by following these
steps.
- Turn off the engine and allow it to cool
down.
- Protect your face, hands and arms from
escaping fluid and steam by covering the
cap with a large, thick rag .
- Turn the cap slowly and very carefully in
a counter-clockwise direction wh ile ap­
plying light, downward pressure on the
top of the cap .
- To avoid being burned, do not spill ant i­
freeze or coolant on the exhaust system
or hot eng ine parts. Under certain condi­
t io ns, the ethy lene g lycol in engine cool­
an t ca n ca tch f ire.
0 Note
Do not add any type of radiator leak seal­
ant to your vehicle's eng ine coolant. Add­
ing radiato r repair fluid may adve rsely af­
fect the function and performance of your
cooling system and could res ult in damage
not covered by your New Vehicle Limited
Warranty .
Adding coolant
Be very careful when adding engine coolant.
Before you check anything i n the engine com­
pa rtmen t,
a lwa ys read and heed all WARN ­
INGS c:::> A in Working in the engine compart ­
ment on page 256.
.. Tu rn off the engine .
.. Let the engine cool down.
.. Place a thick rag over the coo lant expansion
tank
c> page 263 , fig. 246 and carefully
twist the cap counter-clockwise c> ,&. .
.. Add coo lant m ixed in the correct rat io
c:::> page 262, Coolant.
.. Twist the cap o n again tightly.
Rep lacement engine coo lant must conform to
exact spec ificat ions
c> page 262, Coolant.
We recommend using only coo lant add it ive
G12 ++, G13 or in an emergency G12 +. Do
not
use a different add itive. In an emergency use
plain water until you can get the correct addi­
t ive and can restore the correct ratio . This
shou ld be done as soon as poss ib le.
If you have lost a considerab le amount of
coolant, the n you should add cold ant ifreeze
and co ld water on ly when the eng ine is cold .
Always use
new engine coolant when refilling.
Do not fi ll coo lant above the "MAX" mark. Ex­
cess coolant will be forced o ut through the
pressure relief valve in the cap when the en­
gine becomes hot.
A WARNING
- The cooling system is under pressure and
can get very hot. Reduce the risk of
scalding from hot coolant by following
these steps.
- Turn off the engine and allow it to coo l
down.
- Protect your face, hands and arms from
escaping fluid and steam by covering
the cap with a large, th ick rag.
- Turn the cap s low ly and very carefully
in a counter-clockwise direction while
applying light, downward pressure on
the top of the cap.
- To avoid being burned, do not spill an­
tifreeze or coolant on the exhaust sys­
tem or hot engi ne parts. Under certain
cond it ions, the ethylene g lycol in e n­
gine coolant can catch fire .

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-Antifreeze is poisonous . Always store an­
t ifreeze in its or iginal container and well
out of the reach of children.
- If you drain the coolant, it must be
caught and safely stored in a proper con­
tainer clearly marked "poison".
(D Note
- Coolant pollutes the environment and
could cause an engine fire. Excess coo l­
ant will be forced out through the pres­
sure re lief va lve in the cap when the en­
gine becomes hot.
- If, in an emergency, only water can be
added, the correct ratio between water
and antifreeze ¢
page 262 must be re­
stored as soon as possib le.
@ For the sake of the environment
Drained coolant should not be reused. Al­
ways dispose of used coolant while observ­ ing all environmental regulations .
Radiator fan
The radiator fan switches on automatically by
itself
The radiator fan is driven by the engine via the
V-belt . The viscous clutch regulates the speed
of the fan accord ing to the temperature of the
coolant .
An auxiliary electric radiator fan* switches on
and off depending on coolant temperature
and other vehicle operating conditions .
After you switch the engine off, the auxilia ry
fan can continue running for up to 10 minutes
- even with the ignition off. It can even switch
on again later by itself¢& , if
- the temperature of the engine coolant rises due to the heat build-up from the engine in
the engine compartment, or
- the engine compartment hea ts up because
the vehicle is parked in intense sunlight .
Checking and fillin g 265
A WARNING
-To reduce the risk of personal injury nev­
er touch the rad iator fan.
- The auxiliary electric fan is temperature
controlled and can switch on suddenly
even when the engine is not running .
- The auxiliary radiator fan switches on au­
tomatically when the engine coolant reaches a certain temperature and will
continue to run until the coo lant temper­
ature drops.
Brake fluid
Checking brake fluid level
The brak e fluid lev el can be check ed with a
quick glance.
N
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:8
Fi g. 247 En gin e compa rtm en t: cover o n the bra ke fluid
reservoir
Before you check anything in the eng ine com­
partment ,
always read and heed all WARN­
INGS ¢ A in Working in the engine compart­
ment on page 256.
.,. Read the brake fluid level from the brake
fluid reservoir ¢
fig. 247, ¢ page 258,
fig. 242.
The brake fluid level must be be­
tween the "MIN" and "MAX" markings .
The brake fluid reservoir is located at the rear
partition of the eng ine compartment on the
left side ¢
page 258.
The fluid level may drop slightly after some
time due to t he automatic adjustment of the
brake pads. This is not cause for alarm. ..,_

2 70 Ch eck ing and filling
Battery replacement
The new battery must have the same specifi­
cations and dimensions as the original equip­
ment battery.
Intelligen t energy management in your veh i­
cle is respons ible for d istributing the e lectr i­
cal en ergy throughout your vehicle
¢ page 228. The intell igent e nergy manage­
ment system w ill keep the eng ine battery
cha rged better then vehicles w ithout this sys­
tem . To make sure the additional e lectrica l en ­
ergy is availab le once again after you have
changed the battery, we recommend that you install batteries of the same type and manu­
facture only (the same as those installed at
the time your vehicle was delivered). Specifi­
cations are listed on the battery hous ing . Your
author ized dealer must code the battery in
the ene rgy management system to enable you
to use the energy management funct ions cor­
rectly after replac ing the battery.
If it is not poss ible to use a battery of this
type, the new battery must have the same ca­
pac ity, voltage (12 volts), amperage , con­
struction and plug seal ing.
When insta lling the battery, make sure the ig­
n it ion and all e lectr ica l consumers a re turned
off.
Q;) Note
Make sure the venti lation hose on the s ide
of the battery is connected, otherwise
fumes or battery ac id can leak o ut.
@ For the sake of the environment
Because of the problem of proper d isposa l
of a battery, we recommend your autho r­
i z ed Audi dealer change the ba tte ry for
you. Bat teries contain s ulfu ric ac id and
lead and must always be disposed of prop ­
erly in compliance with all environmental
reg ulations. Disposing of vehicle batteries
improper ly is very dangerous to the envi­
ronment.
Windshield/headlight
washer container
F ig . 24 9 Eng in e compart ment : cover on t he wi nds hield
and headl ig ht* washe r fluid reservoi r
The washer fluid co nta iner is marked w ith the
symbol Won its cap
¢ fig . 249, ¢page 258,
fig. 242 .
.. Before you check anything in the engine
compartment,
alwa ys read and he ed all
W ARNING S
¢ & in Working in the engine
compartment on page 256 .
.. Lift the fille r cap tongue to add washer flu­
id. You can fi ll the container to the top.
.. Press the cap back onto the fi ller neck afte r
fi lling the container.
You can find the reservo ir
capacity i n the table
in
¢ page 325.
Clean water should be used when filling up . If
poss ible, use soft water to prevent scaling on
the washer jets. A lways add a glass clea ne r
solution (with frost prote ction in the winter).
0 Note
Do not mix engine coolant antifreeze o r
any other additives to fill up the wind­
s hi eld washer rese rvoir.

286 Tires and wheels
build-up, sudden tire failure
and loss of control.
-If the tire pressure is too low or too high, the tires
will wear prematurely and
the vehicle will not handle
well.
-If the tire is not flat and you
do not have to change a
wheel immediately, drive at reduced speed to the near­
est service station to check
the tire pressure and add air
as required.
(D Note
Driving without valve stem
caps can cause damage to
the tire valves. To prevent
this, always make sure that
factory installed valve stem caps on all wheels are secure­
ly mounted on the valve .
@ For the sake of the environment
Underinflated tires will also
increase the fuel consump­
tion .
Tires and vehicle load limits
There are limits to the amount
of load or weight that any vehi­
cle and any tire can carry. Ave­
hicle that is overloaded will not handle well and is more diffi­
cult to stop. Overloading can not only lead to loss of vehicle
control, but can also damage important parts of the vehicle
and can lead to sudden tire fail­
ure, including a blowout and
sudden deflation that can cause
the vehicle to crash .
Your safety and that of your passengers also depends on
making sure that load limits are
not exceeded. Vehicle load in­
cludes everybody and every­
thing in and on the vehicle.
These load limits are technical­
ly referred to as the vehicle's
Gross Vehicle Weight Rating
("GVWR") .
The "GVWR " includes the
weight of the basic vehicle, all
factory installed accessories, a
full tank of fuel, oil, coolant
and other fluids plus maximum load. The maximum load in­
cludes the number of passen­
gers that the vehicle is intend ­
ed to carry ("seating capacity")
with an assumed weight of 150 lbs (68 kg) for each pas­
senger at a designated seating
position and the total weight of
any luggage in the vehicle. If ""

Technical Data
Vehicle identification
F ig. 281 Veh ide Identificat ion Number (VlN) plate: lo ·
c ation on d river 's s ide das h pane l
XXXXX XX · X -XXXX XXX
~ fAllftlli. -llllll · NR. ~ W!ru -llllll -NO.
xx
XXXX XXXX XX X XXXXXXXX
XXX XXX
IYP /TYPE
XX XXXXXXX XX X X XX
XXX KW XXX
®i ~W.::·f :l~~ XXXX XXX XXX
©+ ::rw= xxxx I xxxx XXX I xx
M. · AUSSt I IJ'IIDIIS
~--
EOA 7D 5 4UB 6XM SSG SRW
2E H JDZ 1LB lA S 18A
3FC SMU 7X l
FD A 9G3 OG7 OYH OJF
TL6 3 KA 8EH UlA X98 027
lXW 803 908 824 D2D
7T6 CV7 7KO 4X3 2K2
3L4 4KC 3YO 413 502
1S A 7GB 01A 4GO
XX. X XX X XX X XXXX
Fig. 282
Vehicle identificat io n label: inside the lug­
ga ge compar tmen t
Vehicle Identification Number (VlN)
The Veh icle Iden tifica tion Number is located
in different p laces :
- under the windshield on the driver's side
¢fig. 281.
-in the MMI: Select: !CAR ! function button>
Systems* contro l bu tton > Vehicle ID num­
ber (VIN)
or select: I CAR I function button >
Car systems* control button > Servicing &
~ checks > VIN number .
:3 -on the vehicle identification label. ""'. rl I.O
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Technical Data 323
Vehicle identification label
The vehicle identification label is located in
the luggage compartment under the cargo
floor cover.
T he label¢
fig. 282 shows the following vehi­
cle data :
(D Vehicle Ident ificat ion Number (VIN)
@ Vehicle type, engine o utput, transmission
® Engine and transmission code
© Paint number and interior
® Optional equipment numbers
The information of the vehicle identification
label can also be found in your Warranty
&
Maintenance booklet.
Safety compliance sticker
The safety compliance sticker is your assur­
ance that your new veh icle complies with all
applicable Federal Motor Vehicle Safety
Standards which were in effect at the time the
vehicle was manufactured . You can find this
sticker on the door jamb on the driver's side.
It shows the month and year of production
and the vehicle ident ificat ion number of your
vehicle (perforation) a s well as the Gross Veh i­
cle Weight Rating (GVWR) and the Gross Axle
Weight Rating (GAWR) .
High voltage warning label
The high voltage warning label is located in
the engine compartment next to the engine hood re lease. The spark ign ition system com­
plies with the Ca nadian standard ICES-002 .
Weights
Gross Vehicle Weight Rating
The Gross Vehicle Weight Rating (GVWR), and
the Gross Axle Weight Rating (GAWR) for
front and rear are listed on a sticke r on the
door jamb on the driver's side .
The Gross Vehicle Weight Rating includes the
weight of the bas ic vehicle plus full fuel tank,
o il and coolant, plus maximum load, which in ­
cludes passenger we ight (150 lbs/68 kg per
II>--

328 Con sumer Inf ormation
-Always make su re the transmission se­
lector l ever (automat ic transmiss ion) is
in P (Park position) an d th e park brake is
firmly applied .
@) For the sake of the environment
-Changing the en gine settin gs wi ll ad­
versely affect em iss ion levels . This is det­
rimental to the enviro nment and incr eas­
es fuel consumption .
- Always observe env ironmental regula­
tions when dispos ing of old engine oil,
used brake fluid, dirty engine coolant,
spent batteries or worn o ut tires.
- Undeployed airbag modules and preten­
s ioners might be classified as Perchlo ­
rate Mate rial -spec ial handling may ap­
ply, see www.dtsc.ca .gov/hazardous­
was te/perch lorate . When the veh icle or
parts of the res traint system in cl uding
airbag modules safety belts wit h preten ­
sioners are scrapped, all applicable laws
and regulations must be observed. Your
authori zed Aud i dea ler is familiar with
these requirements and we recommend
that you have your dealer perform this
serv ice for you .
Additional accessories,
modifications and
parts replacement
Additional accessories and parts
replacement
Always consult an authorized Audi dealer be ­
fore purchasing accessories.
Your veh icle incorporates the latest safety de­
sig n featu res ensu ring a high standard of a c­
tive and passive safety .
This safety could be comp romised by non-ap­
proved changes to the ve hicle. For this reason ,
if pa rts have to be replaced , please obse rve
the following points when install ing addition­
a l accessories: Approved Audi accesso
ries and genuine Aud i
parts are available from authorized A udi deal­
ers.
T hese dea le rs a lso have the necessary facili­
ties, tools and tra ined specialists to install the
parts and acc essories proper ly .
A WARNING
-Using the wrong spare pa rts or using non-
approved accessories ca n cause damage to
the veh icle and ser ious persona l injury.
- Use on ly accessories express ly approved
by Audi and ge nuine Audi spare parts
- These parts and accessories have been
specia lly designed to be used on yo ur ve­
h icle .
- Never install accessor ies such as tele­
phone crad les or beverage ho lders on a ir­
bag covers or within the airbag deploy­
ment zones . Do ing so will increase the
risk of injury if a irbags are triggered in an
accide nt!
- Before you check anything in the engine
compa rtment, always read and heed a ll
WARNI NGS
9 page 256 .
(D Note
-If items other than genu ine Audi spare
par ts, add-on equipmen t and accessory
items are used o r if repair wo rk is not
performed ac co rd ing to specified meth­
ods, this c an resu lt in seve re damage to
yo ur vehicle's eng ine and body (such as
co rrosion) and adversely affect yo ur vehi ­
cle's warranty .
- If emergency repairs must be performe d
elsew here, have the vehicle examined by
an authorized A udi dealer as soon as
possible .
- The manufacturer cannot be held liable
for damage wh ic h occ urs due to failure
to comply with these stipu lations.