2016 AUDI A8 engine

Checking and Filling
the engine is warm, the level may be slightly above the "max" marking.
The location of the coolant expansion tank can be
seen in the engine compartment illustration
¢ page 222.
To obtain an accurate reading, the engine must
be switched off.
The expansion tank in your vehicle is equipped
with an electric coolant level sensor.
When the coolant level is too low, the warning
light in the Auto-Check System¢
page 15 will il­
luminate until you add coolant and the level has
been restored to normal. Even though there is an
electric coolant level sensor, we still recommend
you check the coolant level from time to time .
Coolant loss
Coolant loss may indicate a leak in the cooling
system . In the event of coolant loss, the cooling
system should be inspected immediately by your
authorized Audi dealer.
It is not enough merely
to add coolant.
In a
sealed system, losses can occur only if the
boiling point of the coolant is exceeded as a re­
sult of overheating.
_& 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 cool
down.
- Protect your face, hands and arms from es­
caping fluid and steam by covering the cap
with a large, thick rag.
- Turn the cap slowly 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 anti­
freeze or coolant on the exhaust system or
hot engine parts. Under certain conditions,
the ethylene glycol in engine coolant can
catch fire.
228
(D Note
Do not add any type of radiator leak sealant
to your vehicle's engine coolant. Adding radia­
tor repair fluid may adversely affect the func­
tion and performance of your cooling system
and could result in damage not covered by
your New Vehicle Limited Warranty .
Adding coolant
Be very careful when adding engine coolant.
Before you check anything in the engine compart­
ment,
always read and heed all WARNINGS
¢.& in Working in the engine compartment on
page 220 .
.. Requirement: There must be a residual amount
of coolant in the expansion tank ¢(D .
.. Turn off the engine .
.. Let the engine cool down .
.. Place a thick rag over the coolant expansion
tank ¢
page 22 7, fig. 201 and carefully twist
the cap counter-clockwise ¢&, .
.,. Add coolant mixed in the correct ratio
r::!> page 22 7, Coolant up to the MAX marking.
.. Make sure that the fluid level remains stable.
Add more coolant if necessary .
.. Twist the cap on again
tightly.
Replacement engine coolant must conform to ex­
act specifications ¢
page 22 7, Coolant.
We recommend using only coolant additive G12+
+, G13 or in an emergency G12+ . Do
not use a
different additive. In an emergency use plain wa­
ter until you can get the correct additive and can
restore the correct ratio. This should be done as
soon as possible.
If you have lost a considerable amount of cool­
ant, then you should add cold antifreeze and cold
water only when the engine is cold.
Always use
new engine coolant when refilling.
Do not fill coolant above the "MAX" mark . Excess
coolant will be forced out through the pressure
relief valve in the cap when the engine becomes
hot.
~

& 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 coo l
down.
- Protect your face, hands and arms from
escaping flu id and steam by cover ing the
cap w ith a la rge, thick rag.
- Turn the cap slowly and very carefully in a
counter-clockwise d irection while applying
light, downward p ressure on t he top of
the cap.
- T o avoid bei ng bu rned, do not spill anti­
free ze or coo la nt on the e xhaust sys tem or
hot engi ne parts. Under certa in cond i­
tions, the ethylene glycol in eng ine cool ­
ant can catch fire .
- An tifreeze is poisonous. Always store anti­
freeze in its original con tainer and well ou t
of the reach of children.
- If you dra in the coolant, it m ust be ca ught
and safely stored in a proper conta iner
clearly marked "poison" .
(D Note
-Do no t add coolant if the expa nsion tank is
empty. Air cou ld enter the cooling sys tem
and damage the eng ine. If this is the case,
do not continue driving. Seek professional
ass istance.
- Coolant po llutes the environment and could
ca use an eng ine fire . Excess coolant will be
fo rced o ut through the pressure relief valve
i n the cap when the eng ine becomes hot.
- If, in an emergency, only wate r can be add­
ed, the correct ratio between water and an­
tifreeze¢
page 22 7 must be restored as
soon as possib le.
@) For the sake of the environment
Drained coolant sho uld not be reused. Always
dispose of used coolant while observing all
,...,
"' environmental regulat io ns. 0 J:
'SI: ,..., -
Ch eck ing and Filling
Rad iator fan
The radiator fan switches on automatically by it­
self .
The radiator fan is driven by the engine via the V­
belt. The v iscous clutch regulates t he speed of
the fan accord ing to the temperature of the cool­
ant .
An auxiliary e lectr ic radiator fan* sw itches on and
off depend ing o n coo lant temperature and other
vehicle operating conditions.
After you switch the engine off, the auxiliary fan
can continue ru nning for up to 10 m inutes -even
with the ignition off. It can even switch on aga in
later by itself¢,& , if
- the temperature of the engine coolant rises due
to the heat build-up from the engine in the en­
gine compartment, or
- the engine compartment heats up beca use the
veh icle is parked in intense sunlight.
& WARNING
- To reduce the r isk of persona l injury neve r
touch the radia to r fan .
- The auxiliary e lectr ic fan is temperature
controlled and can switch on s uddenly even
when the engine is not ru nning .
- The a uxiliary radiator fan sw itches on auto­
mat ically when the eng ine coolant reaches a
certa in temperature a nd will continue to run
until the coolant temperature d rops.
229

Checking and Filling
Brake fluid
Checking brake fluid level
The brake fluid level can be checked with a quick
glance.
Fig. 202 Eng ine compartment: cove r o n th e brake flu id
r eservoi r
Before you check anything in the engine compart­
ment,
always re ad a nd hee d all W ARNING S
¢ A in Working in the engine compartment on
page 220.
., Read the brake fluid level from the brake fluid
reservoir
<=> fig . 202, ¢page 222. The brake flu ­
id level must be between the "MIN" and "MAX"
mark ings.
The location of the brake fluid reservoir can be seen in the engine compartment illustration
¢ page 222.
The fluid level may drop slightly after some time
due to the automatic adjustment of the brake
pads . This is not cause for alarm .
If the brake fluid level falls
considerably below
the ' 'MIN" mark, the brake warning/indicator
light
1111 (U.S. models)/ . (Canadian models)
will come on¢
page 14 . Do not continue to oper­
ate the vehicle . The complete brake system
should be thoroughly checked by an authorized
Aud i dealer or other q ualified facili ty and the
cause corrected.
If the brake f luid level is too
low, the brake warning/indicator light will i llumi ­
nate. Contact an authorized Audi dealer
immedi­
at ely.
230
Changing brake fluid
Have the brake fluid changed by an experienced
technician .
Brake fluid absorbs moisture from the air. If the
water content in the brake fluid is too high, cor­ rosion in the brake system may result after ape­
riod of time . The boiling po int of the brake fluid
will a lso decrease considerably and decrease
braking performance.
Therefore , the brake fluid must be changed
eve ry
two y ears . Always use new brake fluid which con­
forms to Feder-al Motor Vehicle Standard "FMVSS 116 DO T 4".
The brake fluid reservoir can be difficult to reach ,
therefore, we recommend that you have the brake fluid changed by your author ized
Audi
d ea ler . Your dealer has the correct tools, the
right brake fluid and the know -how to do this for
you.
A WARNING
- Brake fluid is po isonous. It must be stored
only in the closed original container out of
the reach of children!
- Brake fai lure can result from o ld or inappro­
priate brake fluid . Observe these precau­
tions:
- Use only brake fluid that meets SAE speci­ ficat ion
J 1703 and conforms to Federal
Motor Ve hicle Standard 116. Always check
with your authorized Audi dealer to make
sure you are using the correct brake f luid .
The correct type of brake f luid is also indi­
cated on the brake fluid reservoir.
- The brake fluid must be new . Heavy use of
the brakes can cause a vapor lock if the
brake fluid is left in the system too long .
This can seriously affect the efficiency of
the brakes as well as your safety. This
could result in an accident.
(D Note
Brake fluid will damage the paint of your vehi-
cle .
lilJJ,

@ For the sake of the environment
Because of the problem of proper disposal of
brake fluid as we ll as the special toots re­
quired and the necessary expertise, we rec­
ommend that you have the brake fluid
changed by your authorized Audi dealer .
Battery
General information
Under normal operating conditions, the battery
in your Audi does not need any maint enance.
With
high outside temperatures or long daily
drives we recommend tha t you have the electro­
lyte level checked by a service facility. The elec­
trolyte level should also be checked each time
the battery is charged ¢
page 233.
Have the battery checked when you take your ve­
hicle in for serv ice. You are well advised to re­
place a battery that is older than 5 years .
With certain types of airbag deployment, the batte ry is disconnected from the vehicle electri­
cal system for safety reasons¢
& in Repair, care
and disposal of the airbags on page 159 .
Disconnecting the battery terminals
Some vehicle functions (power window regu la­
tors, for example) are lost if the battery te rmi ­
nals are disconnected. These functions have to be
relearned after the battery terminals are con­
nected again. To prevent th is, the battery should
only be disconnected from the vehicle e lectr ica l
system when abso lutely necessary for repairs.
Vehicles not driven for long periods
If you do not drive your vehicle over a period of
several days or weeks, electrical components are
gradually cut back or sw itched off. This reduces
ene rgy consumption and ma inta ins starting ca­
pability over a longer period ¢
page 195. Some
of the convenience functions may not operate,
such as the interior lights or the power seat ad­
justment. The convenience funct ions will be
ava ilable again when you switch on the ignition
and start the engine.
Checking and Filling
Winter operation
During the winter months, battery capacity tends
to decrease as temperatures drop . This is be­
cause more power is also consumed while start­
ing, and the headlights, rear window defogger,
etc., are used more often.
Avo id unnecessary power consumption, particu­
larly in city traffic or when traveling only short
distances . Let your authorized Audi dealer check
the capacity of the vehicle battery before winter
sets in ¢
page 233. A well charged battery will
not only prevent starting problems when the
weather is cold, but will also last longer .
(D Tips
If your vehicle is left standing for several
weeks at extremely low temperatures, the ve­
hicle battery should be removed and stored
where it w ill not freeze . This will prevent it
from be ing damaged and having to be re­
placed.
Working on the battery
Be especially careful when working on or near
the battery.
The battery is located in the luggage compart­
ment under the floor . Before you check anything
in the luggage compartment,
read and heed all
WARNINGS ¢
&-
Always heed the safety warnings, when working
on the vehicle battery or the veh icle electrical
system to prevent injury.
The following WARNINGS are very important
when working on the battery:
Always heed the following WARNING SYM·
BOLS and safety precautions when working on
the battery.
®
Always wear eye protection.
~
Battery acid contains sulfuric acid. Al-
ways wear gloves and eye protection.
231

Check ing and F illing
@
No
- spark s
- fl ame s
- smokin g.
~
Wh en a b att ery is ch arg ed , it produc es
h yd ro ge n ga s which i s explosive and
could cau se per sonal injury.
®
Always keep the b atter y well out of
r each of child ren.
A WARNING
Whenever work ing on the battery or on the
elect rical system, there is the risk of injury,
accident and
even fire. Read and heed the fol­
lowing WARN INGS :
- Always wear eye protection. Do not let bat­
te ry acid or any lead particles get on your
sk in or cloth ing . Sh ield your eyes. Explosive
gases can cause blindness or other injury .
- Battery acid con tains su lfu ric acid. Sulfur ic
acid can cause blindness and severe b urns.
- Always wear gloves and eye protection. Do
no t tilt the battery because acid could leak
out of the ventilat ion open ings .
- If you get battery ac id in your eyes or on
your skin, immediately rinse with cold wa­
ter for several minutes and get medical at­ tention .
- If you should ingest any battery acid, seek
medical attention immediately .
- Do not expose the battery to an open flame,
electric sparks or an open light .
- Do not smoke.
- Do not interchange the positive and nega-
t ive cables.
- When working on the battery, be sure not to
short-circuit the terminals with tools or oth ­
er metal objects. Th is wou ld cause the bat­
tery to heat up
very quickly, which could
lead to damage or explosion and personal
injury .
- When a battery is charged, it produces hy ­
drogen gas which is explosive and could
ca use personal injury.
- Always keep the battery well out of the reach of ch ildre n.
232
-
-Before work is done on the electrical sys­
tem, disconnect the negative gro und cable.
- Before performing any work on the e lectri­
cal system, switch off the engine and ign i­
tion as well as any electrical equ ipment . The
negat ive cab le on the battery must be dis­
connected . If you are just going to replace a
light bulb, then it is enough to switch off
the lights.
- Before d isconnecting the battery, switch off
the anti-theft alarm system! Otherwise you
will set off the alarm.
- When disconnecting the battery, first dis­
connect the negative cab le and then the
positive cable.
- Before reconnect ing the battery, make sure
all electr ica l consume rs a re switched off .
Reconnect the positive cable first and then
the negative cable . Never in terch ange t he
cables -this could sta rt a fire!
- Never cha rge a frozen or a thawed-out bat­
tery . It cou ld explode ! If a ba ttery has fro­
zen, then it must be replaced. A discharged
battery can freeze over at 32 ° F (0 °C).
- Make sure the
vent hose is always attached
to the opening on the side of the battery .
- Never use batter ies which are damaged.
There is the danger of an exp losion! Always
replace a damaged battery .
A WARNING
Califo rnia Proposition 65 Warning :
- Batte ry posts, te rm inals and related acces­
sories contain lead and lead compounds,
chemicals known to the State o f Cali fornia
to cause cancer and reproductive problems.
Wash hands after handling.
(D Note
- Do not disconnect the vehicle battery when
the ignition is on or when the engine is run­
ning, otherwise, you w ill damage electronic
components in the electrical system.
- If your veh icle is go ing to stand for a long
period of time w ithout being driven, protect
the battery from "freezing", otherwise it ..,.

will be damaged and will then have to be re­
placed.
Battery charging
Starting the engine requires a well charged bat­
tery.
Fig. 203 Engine co mpa rtment: connectors fo r a c harger
and jump start cables
Always read and heed all WARNINGS below
~ &. and
¢ A in Working on the battery on
page 232.
• Switch off the ignition and all electrical con­
sumers .
• Make sure the area is well ventilated when you
charge the battery.
• Open the engine hood
~ page 220.
• Remove the cover (D by pressing on the arrow
¢ fig . 203.
• Open the cover @on the positive terminal.
• Connect the charger connectors according to
the instructions to the
jump start bolts. (Bolts
under the red cover= "positive" , Bolts with hex
head
= "negat ive").
• Only now plug the mains lead for the charging
equipment into the wall outlet and turn it on
¢&,, .
• Make sure the charging rate is not over
30 amps/14.8 Volt.
• When the battery is fully charged: Turn the
charging equipment off and remove the mains
lead from the wall outlet .
• Now remove the clamps for the charging equip-
ment.
~ • Close the red cover on the positive pole. 0
~ • Close the hood~ page 221.
rl I.Cl U"I
rl I.Cl rl
Checking and Filling
A discharged battery can freeze at temperatures
of only 32 F
0 (0 °C). Allow a frozen battery to
thaw completely before attempting to charge it
¢ &. However , we recommend not using a
thawed battery again because the battery casing can be cracked due to ice formation and can leak
battery acid.
Battery charging (Maximum charging rate of
30 amps/14.8 Volt)
When charging at low voltages (e.g . w ith a trick­
le charger),
the battery cables do not have to be
disconnected first. The battery caps should
not
be opened when charging a battery.
It is not necessary to remove the battery from
the luggage compartment, and it is also not nec­
essary to disconnect the cables .
Fast charging the battery (charging rate
above 14.8 Volts)
For technical reasons do not use a battery charg­
er that uses voltage greater than 14.8 Volts to
charge your vehicle's battery.
.&_ WARNING
Charging a battery can be dangerous.
- Always follow the operating instructions
provided by the battery charger manufactur­
e r when charging your battery.
- Never charge a frozen battery. It may ex­
p lode because of gas trapped in the ice. Al­
low a frozen battery to thaw out first.
- Do not reuse batteries which were frozen.
The battery housing may have cracked and
weakened when the battery froze.
- Charge the battery in a well ventilated area.
Keep away from open flame or electrical
spark. Do not smoke. Hydrogen gas generat­
ed by the battery is explosive.
- To reduce the danger of explosion, never
connect or disconnect charger cables while
the charger is operating.
- Fast charging a battery is dangerous and
should only be attempted by a competent
technician with the proper equipment.
- Battery acid that may spill during charging
should be washed off with a so lution of
233

Check ing and F illing
warm water and baking soda to neutralize
the acid.
CD Note
Never use a fast charger as a booster to start
the engine . This will serious ly damage sensi­
tive electronic components, such as control
units, relays, radio, etc., as well as the battery
charger.
Battery replacement
T he new battery must have the same specifica­
t ions and dimensions as the original equipmen t
bat tery.
Int elli g ent en ergy managem ent in your vehicle is
responsible for distributing the electrical energy
throughout your vehicle
r=> page 195. The intelli­
gent energy management system will keep the
engine battery charged better than veh icles w ith­
out this system . To make sure the addit ional
e lectrical energy is avai lab le once again after you
have changed the battery, we recommend that
you install batteries of the same type and manu­ facture on ly (the same as those installed at the
time your vehicle was delivered). Specifications
are listed on the battery housing. Your author­
i z ed dealer must code the battery in the energy
management system to enable you to use the en­
ergy management functions correctly after re ­
placing the battery .
The new battery must have the same capacity,
voltage (12 volts) , amperage, construction and
plug sealing .
When installing the battery, make sure the igni­
tion and all electrical consumers are sw itched
off.
CD Note
- Make sure the ventilation hose on the s ide
of the battery is connected, otherw ise
fumes or battery ac id can leak out.
- Vehicles with the Start-Stop-System* are equipped with a special cycle-proof AGM battery . Installing a d ifferent type of bat­
tery can cause problems in the vehicle elec -
234
trical system. When replacing the vehicle
battery, always install one with the same
specifications as the original battery .
- Battery mounts and clamps m ust always be
secured correctly.
- Read and follow the warnings under
¢ page 231, Working on the battery before
performing any work on the battery .
@ For the sake of the environment
Because of the p roblem of proper disposal of
a battery, we recommend your authorized
A udi dealer change the battery for you . Bat­
teries contain sulfur ic acid and lead and must
a lways be disposed of properly in compliance
with all environmental regulations . Disposing
of veh icle batteries improperly is very danger­
ous to the environment .
Windshield washer
system
Fig. 204 En gin e compa rt ment: washer fluid rese rvoir cap
The w indshield washer fluid reservo ir Q conta ins
the cleaning solution for the w indshield and the
headlight washe r system ¢
fig. 204, ¢ page 222.
The reservoir capacity is found in
r=> page 2 78 .
To reduce the risk of lime scale depos its on the
spray nozzles, use clean water with low amounts
of calcium. Always add w indow cleaner to the wa­
ter . When the outside temperat ures are cold , an
anti-freez ing agent shou ld be added to the water
so that it does not freeze. ..,.

Wheels
Tire pressure
Model/ Tire designation Normal load Maximum load
Engine (up
to
2*/3 people)a>
front rear front rear
PSI kPA PSI kPA PSI kPA PSI kPA
A8/A8 L : 235/55 Rl8 104H
35 240 32 220 36 250 38 260
3.0L
255/45 Rl9 104H 35 2
4 0
32 22 0 36 25 0 38 2 60
6 cylinders 265/40 R20 104H 35 24 0 32 220 36 250 38 260
265/40 R20 104V 33 2
30 32 22 0
33 2
30
35 240
275/35 R21 103Y
XL 35 240 32 220 36 250 35 240
A8/A8 L: 235/55 Rl8 104H 35 240 32 22
0
38 26
0
38 26
0
4.0L
255/45 Rl9 104H 35 240 32 220 38 260 38 260
8 cylinders 265/40 R20 104H 35 240
32 220
38 260
38 2
60
265/40 R20 104Y 33 230 32 220 35 240
35 240
275/35 R21 103V XL 35 240 32 2 20 38 260
38 260
AB L: 265/40 R20 104Y 35 240 32 220 36 250 35 240
6.3L
255/45 Rl9 104H 36 25 0 32 2 20
39 270 38 260
12 cylin-265/40 R20 104H 36 25
0 32 220 39 270 38 260
ders
275/35 R21 103Y XL 35 24 0 32 220 36 250 35 240
58: 265/40 R20 104Y 36 250 32 22 0 39 27
0
38 260
4.0L 265/35 R21 101 Y 39 270 35 240 44 300 42 290
8 cylinders 275/35 R21 103V XL 39 27
0
35 2
4 0 4 4
300 42
290
a) Vehicles with 4 seating positions: two people in the front, Vehicles with S seating
positions:
two people in the front , one person in the rear
A WARNING
Please note the important safe­
ty precautions regarding tire
pressure ¢
page 246 and load
limits¢
page 248.
Tires and vehicle load limits
There are limits to the amount of
load or weight that any vehicle
and any tire can carry. A vehicle
that is overloaded will not handle
well and is more difficult to stop.
248
Overloading can not only lead to
loss of vehicle control, but can al­
so damage important parts of the
vehicle and can lead to sudden
tire failure, including a blowout
and sudden deflation that can
cause the vehicle to crash.
Your safety and that of your pas­
sengers also depends on making
sure that load limits are not ex­
ceeded . Vehicle load includes ev ­
erybody and everything in and on
the vehicle. These load limits are ..,.