2010 AUDI S8 radiator cap

Driver information display
is too low. An additional driver message can also be displayed
by pressing the [CHECK) button:
Switch off engine and check coolant level
-Pull off the road .
- Stop the vehicle.
- Turn off the engine.
- Check coolant level=>
page 297.
-Add coolant if necessary=> page 298.
-Continue driving only after the engine coolant
warning/indicator light goes out.
- Contact your authorized Audi dealer for assistance if
necessary.
If the engine coolant level is correct, then the radiator fan may be the
cause of the malfunction.
If the generator warning/indicator light should also illuminate
=>
page 16, then the fan belt may be damaged .
& WARNING
• If your vehicle should break down for mechanical or other
reasons, park at a safe distance from moving traffic, turn off the
engine and turn on the hazard warning lights=>
page 63, "Emer­
gency flasher A".
• Never open the hood if you see or hear steam or coolant
escaping from the engine compartment -you risk being scalded.
Wait until you can no longer see or hear steam or coolant
escaping.
• The engine compartment of any vehicle is a dangerous area.
Before you perform any work in the engine compartment, turn of
& WARNING (continued)
the engine and allow it to cool. Follow the warning stickers
=> page 281, "Engine compartment".
0 Note
Do not continue driving if the -~-symbol illuminates. There is a
malfunction in the engine cooling system -you could damage your
engine. •
Engine oil pressure malfunction "t':::7':
The red engine oil pressure warning symbol requires
immediate service or repair. Driving with a low-oil-pres­
sure indication is likely to inflict severe damage to the
engine.
If the ~ symbol appears in the display and blinks, the oil
pressure is too low. An additional driver message can also be
displayed by pressing the [CHECK] button:
Switch off engine and check oil level
Immediate actions
-Pull off the road .
- Stop the vehicle.
- Turn off the engine .
-Check the engine oil level with the dipstick=> page 293.
Dipstick readings checks too low
- Top off oil to the proper level=> page 294.

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Closing the engine hood
- Pull the hood down until the pressure from the struts is
reduced.
- Let the hood
drop down and latch in place. Do not try to
push it shut;
it may fail to engage=:> &.
& WARNING
A hood that is not completely latched could fly up and block your
view while driving.
• When you close the engine hood, check it to make sure the
safety catch has properly engaged. The hood should be flush with
the surrounding vehicle body parts.
• If you notice while driving that the hood is not secured prop­
erly, stop at once and close it. •
Working in the engine compartment
Be especially careful whenever you work in the engine
compartment.
Whenever you must perform any work in the engine compartment,
for example checking and filling different fluids, there is a risk of injury, burns and accidents. To prevent personal injury always
observe the following WARNINGS. The engine compartment of any
vehicle is a hazardous area=>& .
& WARNING
To help avoid injury, before you check anything under the hood:
• Turn off the engine.
• Remove the ignition key.
• Apply the parking brake.
Safety first
& WARNING (continued)
• 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 compart­
ment. Wait until no steam or coolant can be seen or heard before
carefully opening the hood.
• Keep children away from the engine compartment.
• Never spill fluids on hot engine components. They can cause a
fire. • Never touch the radiator fan. The auxiliary electric fan is
temperature controlled and can switch on suddenly.
• Never open the coolant reservoir cap when the engine is still
warm. The coolant system is pressurized and hot coolant 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.
• If work on the fuel system or the electrical system is necessary:
- Always disconnect the battery.
- Never smoke or work near heaters or open flames. Fluids in
the engine compartment could start a fire.
- Keep an approved fire extinguisher immediately available.
• To avoid electrical shock and personal injury 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:
- First, fully apply the parking brake, move selector lever to
"P" (Park). .,
Vehicle care Technical data

___ C_h_ e_c _k _i_n -=g :a,__ a_n_ d_ f_ i_ l _li _n _,g;._ __________________________________________ _
& WARNING (continued)
-Always use extreme caution to prevent clothing, jewelry, or
long hair from getting caught in the radiator fan, V-belts or
other moving parts, or from contacting 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=:>
/1::..
& WARNING
California Proposition 65 Warning:
• Engine exhaust, some of its constituents, and certain vehicle
components contain or emit chemicals known to the State of Cali­
fornia to cause cancer and birth defects and reproductive harm. In
addition, certain fluids contained in vehicles and certain products
of component wear contain or emit chemicals known to the State
of California to cause cancer and birth defects or other reproduc­
tive harm.
• Battery posts, terminals and related accessories contain lead
and lead compounds, chemicals known to the State of California
to cause cancer and reproductive harms. Wash hands after
handling.
0 Note
When adding fluids, always make sure that they are poured into the
proper container or filler opening, otherwise serious damage to
vehicle systems wi ll occur.
ci> For the sake of the environment
To detect leaks in time, inspect the vehicle floor pan from underneath
reg ular ly. If yo u see spots from oil or other vehicle fluids, have your
vehicle inspected by an authorized Audi dea ler.•
Engine compartment
Applies to veh icles: w ith 8 -cylinde r engine
Engine compartment overview : a-cylinder
engine
These are the most important items that you can check.
Fig. 241 Typical layout for containers, engine oil dipstick and engine oil filler
cap
© Windshield/headlight washer container (0 ) ....... .
@ Brake fluid reservoir ( ) .................. .. .. . .
® Engine oil filler cap ('l=r.) ............ .. .... .. .. . .
© Engine oil dipstick (orange) .............. .. . ... . .
© Power steering reservoir . .. .. .. .. .. ... .... .. .. . .
© Coolant expansion tank (-L ) ........... .. .. .. .. . .
305
299
294
293
257
297 ..

lffll __ C_ h_ e_c _k _i _ n _g ~ a_n _d_ f_il _l_in _ g _________________________________________ _
& WARNING (conti nu ed )
• Protect your f ace, hand s and arms from e scaping fluid and
s team by covering the cap with a larg e, thick rag.
• Turn the cap slowl y and ver y ca refull y in a counter-clockwise
direct ion while applying light, downward pre ssure on the top of
the cap.
• To avoid being burned , do not spill antifreeze or coolant on the
exhaust system or hot engine part s. Under certain conditions, the
ethylene glycol in engine coolant can catch fire.
0 Note
Do not add any type of radiator leak sealant to yo ur vehicle's engine
coo lant. Adding radiator repair fluid may adverse ly affect the func­
t ion and perfo rmance of your cooling system and could result in
damage not covered by your New Vehicle Limited Warranty .
[ i J Tips
On vehicles with the 12-cylinder engine, the expansion tank is located
unde r a cover. •
Adding coolant
Be very careful when adding engine coolant.
Before you check anything in the eng ine compartment,
always read and heed all WARNINGS~ & in "Working in
t h e e ngine compar tment" on
page 289 .
-Tur n off the eng ine.
- Let t he engi ne cool down. -
Place a t hick rag over the coolant ex pansio n tank
~ page 297, fig . 247 and carefully twis t the ca p counte r­
clockw ise
~ & .
- Add coo lant.
- Tw ist t he cap on agai n
tightly.
Replacement eng ine coolant must conform to exact specificat ions
=> p age 2 96, "Coolan t". Even in an emergency, if coolan t ad di tive
Gl2 ++, Gl2+ or Gl2 is not available, do
not use a d ifferent addit ive.
Use plain water instead until you can get the correct additive a nd can
restore the correct ratio . This s hou ld be done as soon as possible .
If you have lost a conside rable amount of coolant , then you sho uld
add co ld a ntifree ze a nd cold water only when t he e ngine is cold .
Always use
new engine coo lant when refilling.
Do not fill coolant above t he "MAX" mark. Excess coo lant wi ll be
forced out t hrough the p ressure relief va lve in the cap w hen the
eng ine becomes hot.
& 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 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 while applying light, downward pressure on the top
of the cap.
- To avoid being burned , do not spill antifreeze or coolant on
the exh aust system or hot engine parts. Under certain condi-
tions, the ethylene gly col in engine coolant can catch fire. .,

Checking and filling ------------------------------- ---=.:..:..=.:=~..:::..:.....:..:.;__ ___ _::,______,.J
& WARNING (co ntinued )
• Antifreeze is pois onous. Alway s store antifreeze in its original
container and well out of the r each of children.
• If you drain the coolant , it must be caught and safely stored in
a proper container clearly marked "poi son ".
0 Note
• Coolant poll utes the environment and could cause an engine fire .
Excess coolant w ill be forced out throug h the pressure re lief valve in
t he cap when the e ng ine becomes hot .
• If, in an emergency, o nly wate r ca n be adde d, the correct ratio
between water and antifreeze=>
page 296 must be restored as soon
as possib le.
W For the sake of the environment
Dra ined coolant shou ld not be reused. A lways dispose of used coo lant
w hile observ ing a ll enviro nment al regul ations . •
Radiator fan
The radiator fan switches on automatically by itself
T he radi ator fa n is d riven by the engine via th e V-bel t. The v iscous
clutch regu lates the speed of the fan accord ing to the temperature of
t he coolant.
An auxiliary e lectr ic rad iator fan* sw itches on and off depend ing o n
coo la nt tempe rat ur e and othe r vehicle ope ra ting condi tions .
After you switch the engi ne off, the auxilia ry fa n can cont inue r unning
for up to 10 minutes - even w ith the ignition off . It can even switch on
agai n lat er by itse lf => & , if
• the tempe rature of the e ngine coolant rises due to the heat build ­
up from the eng ine in t he engi ne comp art ment, or
Vehicle OP-eration
• the engine compartment heats up because the veh icle is parked in
in tense s unlight.
& WARNING
• To reduce the ri sk of personal injury never touch the radiator
fan.
• The auxiliary electri c fan is temperature controlled and can
switch on suddenly even when the engine is not running .
• The auxiliary radiator fan switches on automatically when the
engine coolant reaches a certain temperature and will cont inue to
run until the coolant temperature drops .•
Brake fluid
Checking brake fluid level
T h e b rake fluid l evel can be ch ecked with a quick glance.
-w ;:;
Fig. 24 8 En gine
compa rtme nt: Brak e
f luid re se rv oi r
Be fore you chec k anyt hin g in the engine compartment,
always read and heed all WARNINGS~ & in "Working in
t h e engine compartm ent" on
page 289 . .,_
Vehicle care Do-it-yourselt service iTechnical data

Alphabetical index Ill
----------------
Proper disposal of drained brake fluid 300
Proper disposal of dra ined engine coolant
298
Proper disposal of drained engine oil 294,
295
Recycl ing used engine o il ....... .. . 294
Unleaded fuel . ............... .. . 283
What should I do with an old battery? ...
304
EPC
See Electronic power control ........ 16
ESP
See E lectronic stabilizat ion program ( ESP)
16
Event Data Recorder (EDR) ....... .... . 252
Exhaust tail pipes
Cleaning .. ............. .. .. .. .. . 276
Expansion tank ........ .. .... .. .... . 297
F
Fan
Radiator .. ............. .. .. .. .. . 299
Fastening Booster seats ............. .. ... .. 239
Convertible child safety seats .... ... 237
Infant seats ..................... 236
Flat tire changing . .. ............. .. . 330
Floor mats .. .... .. .. ... . .. .. .. .... . 193
Fog lights Front .................... .. .. .. .. 62
Rear ........ .... .. .. .. .......... 62
Warning/indicator lights ... .. ...... 17
Folding master key with remote control .. 39
Controls and equip­
ment Safety first
Foot pedals
.... ... ...... .. .. .. ... .. 192
For the sake of the environment
Gasoline fumes and the environment 285
Letting your engine warm up .. ..... 119
Reducing engine noise by early upshifting 10
Refueling ........ .. .. .. .. ....... 285
Saving fuel by early upshifting ....... 10
Using the rear window defogger ..... 113
Front airbags Description .. ..... .. .. .. .. ....... 210
How they work .... ....... ...... .. 215
Front ashtray .. .. .. ........ .......... 96
Front fog lights . ..................... 62
Front seats . .. .................. ... . 76
Adjusting .. .. .. ..... .... ...... .. 189
Child restraints in the front seat .. .. 208
Convenience side view .. .. .. .. ...... 81
Pockets ............... .. .. .... .. 100
Symmetrical seat positions .......... 81
Frontal collisions and the laws of physics 198
Fuel Additives .. .. .... .... ........... 283
Average consumption .. ............ 36
Blended gasoline .... .. .. .. ....... 283
Fuel filler neck .. ..... ...... ...... 284
Fuel gauge . ........ ......... ..... 12
Gasoline ... .. ... ........ ........ 283
Gasoline additives ................ 284
Instantaneous fuel consumption .... . 36
Low fuel level symbol .. .. .......... 33
Octane rating ...... .............. 283
Recommendation ................ 283 Refuelling
.. .. .. .. ... ...... ... .. 285
Reserve ......... ........ ... .. ... . 12
Tank capacity . . . . . . . . . . . . . . . . 12, 360
Unlocking the fuel filler flap by hand . 287
Fuse arrangement ............ .. .. .. . 342
G
Garage door opener (Homelink ®) ...... 181
Gas discharge lamps .......... .. .. .. . 346
Gauges Engine coolant temperature ......... 10
Fuel gauge .. .. ... ................ 12
Speedometer ....... ...... .. . ... .. 12
Tac hometer ..... .. ............... 11
Tr ip odometer ............ .... .. .. 12
General illustration Instruments and controls .. ... . ... .. . 9
Generator Warning/indicator lights ... ... . .. .. 16
Glossary of tire and loading terminology 307
Glove compartment ... .... ...... ..... 99
cd changer .. .. .. .. .. .. ... ....... . 99
Owner's Literature ................ . 99
Gross Vehicle Weight Rating (GVWR) ... 357
H
Head restraints ..................... 191
Adjusting .......... ...... .. .... . 191
Comfort head restraints ............ 81
Front seats .. ...... ............... 81
Rear seats .. .. .. .. .. .. .. ..... .... 82
Vehicle operation Vehicle care Do-it-yourself service Technical data