2015 AUDI S8 coolant temperature

236 Check ing and filling
@ For the sake of the environment
- Before changing your oil , first make sure
you know where you can properly dispose
of the used oil.
- Always dispose of used engine oil proper­
l y. Do not dump it on garden soi l, wood­
ed areas, into open streams or down
sewage dra ins.
- Recycle used engine oil by taking it to a
used engine oil collection facility in your
area, or contact a service station .
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.
The cooling system is sea led and generally re­
qu ires little attention .
The cooling system has been filled at the fac ­
tory with a pe rmanent coolant which does not
need to be c hanged. The coolant consists of a
mixture of spec ia lly conditioned water and the
manufacturer 's glycol-based coo lant add i-
tive G l3 antifreeze with ant icorrosion addi ­
tives (50% for USA models ; 60% for Canadian
mod els). This mixture both assures the nec es­
sary frost protection and protects metal com­ ponents in the engine's cooling sys tem from
corrosion and scaling . It a lso raises the boil­
ing point of the coolant .
Do not red uce the concentration of the coo l­
ant in the summer by adding plain water.
The
proportion of coolant add it ive mu st be at
l e a st 50 % but not more than 60 %
to main­
tain antifreeze protection and cooling efficien­
cy . If the coolant frost prote ct ion is too low,
the coo lant cou ld freeze and damage the veh i­
cle hea ting and eng ine cooling system.
For yea r-round d riving, antifreeze is added at
the fac to ry for temperatures down to:
-- 31°F( -35°C)USA
- -40 °F ( -40 °C) Canada. If
you must add coolant, use a mixture o f wa ­
ter and coolant additive . Mixing the coo lant
additive with distilled water is recommended.
A WARNING
-
Before you c heck anything in the engine
compartment, always read and heed a ll
WAR NINGS
c::, & in Working in the engine
compartment on page 228.
(D Note
- Before winter sets in, have the coo lant
checked to see if the coolant additive in
your vehicle is sufficient to meet the cli­ mate conditions . This is especia lly impor­
tant if you live in a reg ion where the win­
ter is ex treme ly cold. If ne cessa ry, i n­
crease the pr opo rtion of coo lant add itive
t o 60%.
- Whe n adding coolant additive to yo ur
c ooling sys tem, remembe r:
- We recommend using on ly coolant ad ­
d itive Gl2++ or Gl3 for your vehicle .
This coolant additive is availab le at au­
thor ized Audi dealers . Other types of
ant ifreeze can s ignificant ly reduce cor­
rosion protection. The resulti ng cor ro­
sion can ca use a loss o f coolan t and se­
rio us engine damage.
- Do not add any type of rad iator leak seal­
a nt to yo ur vehicle 's engine coolant.
Add ing radiator repai r fl ui d may adverse ­
ly affect the function and performance of
your cooling system and co uld resu lt in
damage not covered by yo ur New Vehicle
Limited Warranty.
-

238 Check ing and filling
• Let the engine coo l down .
• Place a thick rag over the coolant expansion
tank
¢ page 237, fig . 204 and care full y
twist the cap counter-clockwise¢ _&..
• Add coolant mixed in the correct ratio
¢
page 236, Coolant up to the MAX mark­
i ng.
• Make sure that the fluid level rema ins sta-
ble. Add more coolant if necessary.
• Twist the cap on again
tightly.
Replacement engine coolant must conform to
exact specifications ¢
page 236, Coolant.
We recommend using only coolant additive
G12++, G13 or in an emergency G12+ . Do not
use a different additive . In an emergency use
p la in water unt il you can get the correct add i­
tive and can restore the correct ratio. This
should be done as soon as possible .
If you have lost a considerable amount of
coolant, then you should add co ld antifreeze
and cold water only when the engine is co ld.
Always use
new eng ine coolant when refilling .
Do not fi ll coolant above the "MAX" mark. Ex­
cess coolant will be forced out through the pressure relief valve in the cap when the en­
g ine becomes hot .
A WARNING
- T he coo ling system is under p ressure and
can get very hot. Reduce the risk of
scalding from ho t coolant by following
these steps.
-Turn off the eng ine and a llow it to cool
down.
- Protect your face, hands and arms from escaping flu id and steam by cover ing
the cap with a large, thick rag.
- T urn the cap slowly and very carefully
in a counter-clockwise d irect ion while
apply ing light, downward pressure on
the top of the cap.
- To avo id being burned, do not sp ill an­
tifreeze or coolant on the exhaust sys­
tem or hot engine parts . Under certa in cond
it ions, the ethylene g lycol in en­
gine coolant can catch fire.
- Antifreeze is poisonous . A lways store an­
tifreeze in its origina l container and well
out of the reach of children.
- If you dra in the coo lant, it must be
caught and safely stored in a proper con­
tainer clearly marked "po ison".
@ Note
- Do not add coolant if the expansion tank
is empty. Air co uld enter the cooling sys­
tem and damage the engine. If this is
the case, do not cont inue driving. Seek
professional assistance .
- Coo lant pollutes the environment and
cou ld cause an engine f ire. Excess cool­
ant will be forced out through the pres­
sure relief valve in the cap when the en­
gine becomes hot.
- If, in an eme rgency, only wate r can be
added, the co rrect ratio between water
and antifreeze ¢
page 236 must be re­
stored as soon as possible.
@ For the sake of the environment
D rained coolant should not be reused . Al­
ways d ispose of used coolant while observ­
i ng all envi ro nmental regula tions.
Radiator fan
The radiator fan switches on automatically by
itself
The rad iator fan is driven by the e ngine via the
V-belt. The viscous clutch regulates the speed of the fan acco rding to the temperatu re of the
coolant.
An auxiliary electric radiato r fan* sw itches on
and off depending on coolant temperature
and ot her vehicle ope rat ing condit io ns.
After you switch the eng ine off, the aux iliary
fan can continue running for up to 10 m inutes
- even w ith the ignition off .
It can even switch
o n aga in later by itself¢.& , if
1111>

- the temperature of the engine coolant rises
due to th e heat bui ld-up from the engine in
the engine compartment, or
- the engine compartment heats up because
the vehicle is parked in intense sunlight.
.&_ WARNING
- To reduce the r isk of personal injury nev­
er touch the radiator fan.
- The auxiliary electr ic fan is temperature
controlled and can switch on sudden ly
even when the engine is not runn ing.
- The auxiliary radiator fan switches on au­ tomat ically when the engine coolant
reaches a certain temperature and will
continue to run until the coolant temper ­
at ure drops.
Brake fluid
Checking brake fluid level
The brake fluid level can be checked with a
quick glance.
N N
-N
i
F ig . 2 05 Eng ine co mpartmen t: cove r on the b rake f lui d
r eservo ir
Before you check anything in th e engine com­
partment,
alwa ys read and he ed all WARN­
INGS c::> .&. in Working in the engine compart­
ment on page 2 28.
~ Read the brake fluid level from the brake
fl uid reservo ir ~
fig . 205, c::> page 230. The
brake f luid leve l must be betwee n the "M IN"
and "M AX" marki ngs.
The location of the brake fl uid reservo ir can be
see n in t he engi ne comp artment illus trati on
c::> page 230.
Checkin g and fillin g 239
The fluid level may d rop slightly afte r some
time due to the automatic adjustment of the
brake pads . T his is not cause for alarm .
If the brake flu id leve l falls considerably be­
low the "MIN" mark, the brake warning/indi­
cator light . (U.S. models) . (Canadian
models) w ill come on
~ page 14 . Do not con­
tin ue to operate the vehicle . The complete
brake sys tem should be thoroughly checked
by an authorized Audi dea ler or other quali ­
fied facility and the cause corrected.
If the
brake f lu id leve l is too low, the brake warning/
indica tor ligh t will illumi nate. Conta ct an au­
thorized Aud i de aler
immediately .
Changing brake fluid
Have the brake fluid changed by an experi­
en ced technician.
B rake fluid absorbs moisture from the air . If
the water content in the brake fluid is too
high, co rrosion in the brake system may resu lt
after a pe riod of time. The boiling point of the
brake f lu id will also dec rease conside rably and
decrease brak ing performance.
T herefo re , the bra ke fluid must be changed
every tw o year s. Always use new br ake f lu id
which con forms to Federal Mo tor Veh icle
Standard " FMVSS 116 DOT 4".
T he bra ke fluid reservo ir can be d iff icu lt to
reach, the refore, we recommend that you
have the bra ke fluid changed by your author­
ized
Audi dealer. Your dealer has the cor rect
tools, the right brake fluid and the know -how
to do this for you.
A WARNING
---- Brake flu id is poisonous. It must be stor­
ed only in the closed or iginal container
out of the reach of children!
- Brake failure can resu lt from old or inap­
prop riate brake f lu id. Observe these pre­
cautions:
- U se only brake fluid tha t meets SAE
specificat ion
J 1703 and conforms to
Federa l Motor Vehicle Standard 116.

24 6 T ire s and whee ls
- Never mount used tires on yo ur vehicle if
you are not sure of their "previous histo­
ry." Old used tires may have been dam­
aged even though the damage cannot be
seen that can lead to sudden tire failure
and loss of vehicle control.
- If you notice unusual vibration or if the
vehicle pulls to one side when driving, al­
ways stop as soon as it is safe to do so and check the wheels and tires for dam­
age.
(D Note
- Please note that summer and winter
tires are designed for the cond itions that
a re typ ica l in those seasons. Aud i recom­
mends using w inter t ires d uring the win-
Glossary of tire and loading terminology
Accessory weight
means t he comb ined weight (in excess of
those standard items which may be rep laced)
of automatic transmission, power steering,
power brakes, power windows, power seats,
radio, and heater, to the extent that these
items are available as factory-installed equip­
ment (whether installed or not).
Aspect ratio
means t he ratio of the height to the width of
the tire in percent. Numbers of 55 or lower in­
d icate a low sidewall for improved steer ing re­
sponse and better overall handling on dry pavement .
Bead
means the pa rt of the tire t hat is made of
steel wires, wrapped or reinforced by ply cords
and that is shaped to fit the r im.
Bead separation
means a breakdown of the bond between
components in the bead.
Cord
means t he strands forming the plies in the
tire. ter months.
Low tempe ratu res signifi­
cantly decrease the elasticity of summer
tires, which affects traction and braking ability. If summer tires are used in very
co ld temperatures, cracks can form on
the tread bars, resu lting in permanent
tire damage that can cause loud driving noise and unbalanced tires. Aud i is not
responsib le for this type of damage.
- Burn ished, polished or chromed rims
must not be used in winter weather. The
surface of the rims does not have suff i­
c ien t corrosion protect io n for this and
cou ld be pe rmanently damaged by road
salt or simi lar substances. This damage
is not covered by war ranty.
Cold tire inflat ion pre ssure
means the t ire press ure recommended by the
vehicle manufacturer for a tire o f a des ignated
size that has not been driven for more than a
coup le of miles (ki lometers) at low speeds in
the three hour period before the tire press ure
is measured or adjusted.
Curb weight
means the weight of a motor vehicle w ith
standard equipment including the maximum
capacity of fuel, o il, and coolant, air cond i­
tion ing and additional weight of optiona l
equipment.
E x tra load tire
means a tire design to operate at higher loads
and at higher inflation pressures than the cor­
responding standard tire. Extra load tires may
be identified as "XL", "xl", "EXTRA LOAD", or
"RF" on the sidewall.
Gross A xle Weight Rating ("GAWR ")
means the load-carrying capacity of a single
axle system, measured at the tire-ground in -
terfaces.
IJ>,

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'SI: ,...., \!) 1.1'1 ,...., 1.1'1 ,....,
A
A/C (automatic climate control) .... .. .. 79
ABS
refer to Anti-lock braking system .. .. . 197
Accessories .. ................. .. ... 292
Active lane ass ist ............ .... .. . 101
Activating and deactivating ... .. .. .. . 102
C leaning the camera area . ... .. .. ... 215
Descr ipt ion ..... ...... ... .. .. ..... 101
Instrument cluster indicator light .... 102 Messages . . . . . . . . . . . . . . . . . . . . . . . . 102
Notes on instrument cluster display .. . 102
Sett ing the steering wheel vibrat ion .. . 103
Adaptive air s uspension/sport . ....... . 108
Adapt ive cru ise control ...... .. .. .. .. .. 9 2
C lean ing t he senso r ....... .. .. .. .. . 215
M essages . ... .... .... ... .. .. .. .... 99
Request for driver intervention . ... .. .. 97
Stop-and-go traffic . . . . . . . . . . . . . . . . . 96
Adapt ive Lig ht (defective) ... .. .. .. .. .. 2 2
AdBlue .... .. ................. .. ... 225
F illing . .. ... ...... ............. .. 226
Messages in the instrument cluster dis-
p lay . .... .. .......... ... .... .. .. . 225
Adding Eng ine coolant ........... .. .. .. ... 237
Eng ine oil ............ .... ... ... .. 234
W indshield was her fluid . ...... ... .. 244
Addit ives
Eng ine oil .. ............. .... .. ... 234
Ad justable s teer ing colum n .. .. .. .. .. .. 82
Adjusting Air dist ribution (automatic climate con-
trol) . .. .. .. .. .. ........... .. .. .... 80
Fr ont se ats . . . . . . . . . . . . . . . . . . . . . . . . 58
I ns trumen t illum ina tion ... .. .. .. .. .. 51
Steer ing colum n ....... ... .. .. .. .. .. 82
Temperature (automatic climate control) 80
A irbag system ............. .... 15 1, 170
Advan ced Airbag System . .. .. .. .. .. . 155
Advanced Airbag Sys tem components . 15 8
Ca re ... .. .. .. ... .. ..... ... .. .. ... 164
C hildren ... .... .. .... ... .. .. .. ... 175
Chil d restraints . ... .... ... .. .. .... . 176
Components (front airbags) .. .. .. .. . 158
Danger of fitting a child seat on the front
passenger seat . . . . . . . . . . . . . . . . . . . . 153
Inde x 295
Disposa l .. .. .... .. . .. .. ..... ... .. 164
Front airbags . . . . . . . . . . . . . . . . 155, 156
•
How do the front airbags work? . ... .. 160 •
How many a irbags does my vehicle
have? ...... .. .. .... ............. 158
How the Advanced Airbag System com -
ponents work togethe r ... .. ... ... .. 159
Impo rtant safety instructions on the
k nee a irbag sys tem . ........... .... 168
Impo rtant t hings to know ....... .. .. 151
K nee a irbags ... .. .. .. .. ...... ... .. 166
Monitoring . ..... ... .. .. ..... ... .. 161
PASSE NGER AIR BAG OF F light ... .. .. 162
Repa irs ... .. .. .. ................. 164
Safety instructions ................. 164
S ide a irbags . .. .. .... ............. 168
S ide curtain airbags . ............... 171
Warning/ind icator lights ... .... ... .. . 18
Wa rning/Indicato r lights ....... .. .. 161
Weigh t-sensing mat ........... .... 175
When must the sys tem be inspec ted? 161
A ircraft
T ranspo rting your vehicle 285
Alcantara Cleaning .. .. .. .. ............... .. 217
A ll Wheel Drive .. .. .... ............. 202
Winter tires ... .... . ... ...... ... .. 260
Alternato r
refer to Generator ............. .... . 16
Amb ience lighting . ................. . 50
Anti -freeze
refer to Engine coolant . ..... ... .. .. 236
An ti- lock b raking system ............ . 197
Warning/ind icator lights . . . . . . . . . 18, 19
Anti-slip regu lation .. ........... .... 197
Warning/ind icator lights .. .. ... ... .. . 18
Anti-theft systems Electronic immob ilizer ....... ... .. .. . 32
ASR
refer to A nt i-slip regula tion ..... .. .. 197
Audi braking guard
refer to Braking gua rd .. .. .. ... ... .. . 92
A udi drive select
refer to Drive se lect ............ .. .. 108
Audi Se rv ice Repair Manuals and Lit era-
ture .. ... .. .. .. .... . ... ...... ... .. 290

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'SI: ,...., \!) 1.1'1 ,...., 1.1'1 ,....,
Index 299
-----------------------------------.......
Emergency warning triangle ... .. .. .. . 266
Energy management ................ 202
Engine Compartment ..................... 230
Coolant .. ............... ......... 236
Data .. .. ..... ........... ...... .. 289
Start-Stop-System . . . . . . . . . . . . . . . . . . 87
start ing .. .. ................. .. .. .. 83
Starting wi th jumper cab les ......... 281
S topping . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Eng ine compartment ................ 230
C losing the hood ................ .. 229
Opening the hood ............ .. ... 228
Safety in structions .......... .. .. ... 228
Wo rking in the engine compa rtment .. 22 8
Eng ine coolant ..................... 236
Adding coolant ............ ...... .. 237
Checking the eng ine coolant leve l ... .. 237
E xpansion ta nk .................... 237
M alf unc tion symbo l ................. 15
Radiato r fan . ..... .... ... .. .. .. ... 238
Temperature ga uge .... ... .. .. .. .. .. 10
E ng ine oil . .. ..... ........ ...... .. . 23 1
Adding . ... ................ ... .. . 234
Addit ives . .. ................. .. .. . 234
Changing . ... ... ..... ... .. .. .. ... 235
C hecking oil level . ..... ... .. .. .. .. . 234
C hec king the engine oil level . ... .. .. . 233
Consumpt ion .................. ... 234
Indications and condit ions requ iring ex-
tra check ing ...................... 233
Indicator light . . . . . . . . . . . . . . . . . . . . . 17
O il consumption .... ... ... .. .. .. .. . 233
O il grades .. ................. .. ... 23 1
P ressu re malfunction ................ 17
Recommended oil check in tervals .. ... 233
Sensor defective . . . . . . . . . . . . . . . . . . . . 21
Specification and viscosity . ... .. .. .. . 23 1
E ng ine sound ............. .... .. .. . 108
Eng ine speed limitat io n ............... 21
E ng ine start -stop mode
refer to Sta rt-Stop -Sys tem ... .. .. .. .. 89
E ntry assistance . . . . . . . . . . . . . . . . . . . . . 64
Environment Break- in period ............... .. ... 205
Catalytic converter ............... .. 206
D iese l part icu late filter ............. 206
Di sposing of yo ur vehicle batte ry 2 43 Driving at high speeds
.. ..... ... .. .. 208
Drivi ng to minimize poll ution and noise 207
Fuel . ... .. .. .. .. .. . .. ... .... ... .. 223
Fuel economy ..................... 207
Leaks under your vehicle ............ 228
Letting the vehicle stand and warm up . 208
Proper disposal of dra ined brake fl uid . 239
Proper disposal of d ra in ed eng ine cool-
an t ............................. 237
P roper disposal of dra ined eng ine
o il . . . . . . . . . . . . . . . . . . . . . . . . . 234, 235
Recycling used engine oil ..... ... .. .. 234
U nl eaded fuel .. .. .. . ... ...... ... .. 220
What shou ld I do with an o ld battery? . 243
E PC
refer to Elect ron ic power control (EPC) . 20
ESC Post-coll is ion b ra ke assist .......... . 198
also refer to Electronic Stab ili zation Con-
t ro l (E SC) ... .. ................... 197
Event Data Recorder (EDR) ............ 196
Exhaust tail pipes Cleaning . ... .... .. . .. .. ..... ... .. 216
E xpansion tank .. ... ................ 237
Exterior lighting ..................... 46
Exterior mi rrors
Adjusting ... .... .. . .. .. ..... ... .. . 55
Dimming ...... ................... . 56
Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
E xterior tempera ture display ........... 23
F
Fastening
B oos ter sea ts .. ................... 182
Convertib le child sa fety seats . ... .. .. 18 1
Infant seats ... .... . ... ...... ... .. 180
Floor mats .. ... .... ........... ..... 139
Fo lding table .... .................... 69
Foot ped als . .... ................... 138
For the sake of the environment
Gasoline fumes and the env ironment .. 223
Reduc ing engine nois e by ea rly upshift-
i ng ............................... 10
Ref uell ing ... .. ................... 22 3
Saving f uel by early upsh ifting ... .. .. . 10
Four zone automat ic climate control ..... 79
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