engine AUDI S8 2010 Repair Manual

Driving and environment
New brake pads
Remember that new brake pads do not have a f ull braki ng
e ff e ct during the first 250 miles (400 kilometers) after they
are i nsta lle d.
New bra ke pads have to be "burnished in" before they have opt ima l
grab=> &.
Dur ing the break -in period, you sho uld avoid putting severe loads on
the brakes. Severe loads incl ude, for example, sudden hard braki ng,
in particu lar at very high s peeds or, for examp le, on mountai n passes.
& WARNING
New brake pads don 't have the be st stopping power and must be
" broken -in " during the initial 100 to 150 miles (150 to 200 kilo­
meters ) of normal cit y driving. You can compensate for thi s by
pressing th e brak e pedal more firmly. This also applies lat er wh en
new pad s are installed. n
Catalytic converter
It is very important that your emissio n contr ol system
(catalytic converter) is functioning prop erly to ensure
that your vehicle is running in an environmentally sound
manner.
- Always use lead-free gasoline==> page 283, "Fue l su pp ly" .
- Never ru n the tank down a ll th e way to empty .
- Never put too m uch motor oil in your engine==>
page 294,
"Adding engine o il - Never try to push- or tow-start your veh ic le .
The catalytic converter is an efficient "clean- up" device bu ilt into the
exha ust syste m of the ve hicle. The cat alytic converte r burns many of
the polluta nts in the exhaust gas before they are released into the
atmosphe re.
Th e e xcl usive use of unleaded fuel is cr itic ally important for the life of
the catalytic converter and proper f unction ing of the engine.
& WARNING
• Do not park or operate the vehicle in areas whe re the hot
exhaust sy stem may come in contact with dry grass, brush, fuel
spill or other material which can cause a fire .
• Do not apply additional undercoating or ru stproofing on or
near the exhaust manifold , exhaust pipes, catalytic conve rter or
heat shield s. During driving, the substance used for undercoating
could overheat and cause a fire .
0 Note
• Be aware that just one tank filling wit h leaded fu el wi ll alrea dy
ser iou sly degrade the performan ce of the ca talyt ic co nve rter.
• Do not exceed the correct engine oil leve l=>
page 294 .
• Do not dr ive unti l the f uel tank becomes complete ly empty. The
eng ine could misfire . Unburned fuel could a lso get into the exha ust
system and th is could cause the catalytic converter to overheat.
• Do not t urn o ff the igni tion whi le the ve hicle is moving.
• Do not continue to operate your vehicle under these conditions, as
o therwi se fuel c an reach the cat alytic c onve rter. Th is cou ld resu lt in
over heating of t he converte r, requiring its rep lacement.
• T o ass ure eff ic ient operat ion of the Emi ssion Co ntro l System:
- Have your vehicle maintained properly and in accordance with
t h e se rvice recommenda tions in your Warranty
& M aintenance
booklet. •

Driving and environment
------------------------------------------------'
- Lack of proper maintena nce as well as improper use of the
vehicle w ill imp air t he funct io n of t he emission con trol system and
could lead to damage.
<£> For the sake of the environment
Even when the Emiss ion Contro l System is operating properly, the
exhaust gas can have a sulfur-like exhaust gas sme ll under some
operat ing states. This depends on the s ulfur content of the fue l being
used. Using a differe nt brand of fuel may help, or filling the tank with
lead-free supe r grade gasoline. •
Avoid damaging the vehicle
When you are dr iving on poor roads, or ove r cur bs, steep r amps, etc.,
make certain that low-lying parts such as spoilers and exhaust system
p arts do not bo ttom ou t and ge t damage d.
Th is is espec ia lly true for vehicles with low-slung chass is (sports
chassis)* and fully loaded vehicles .•
Driving through water on roads
N ote the following to avoid vehicle damage w hen driving through
water, fo r examp le on flooded roads:
• The water must not be any higher than the bottom of the vehicle
b ody.
• Do not drive faster tha n walking speed.
& WARNING
After driving through water , mud, slush , etc. , the brakes may be
slow to take effect because of wet brake rotors and pads . Dry the
brakes first by braking carefully to restore the full braking effect.
Controls and equip­ ment Safety first Vehicle operation
0 Note
Vehicle
compone nts such as the engine, tra nsmiss ion, s uspension or
electrical system can be severely damaged by driv ing thro ugh water .
[ i ] Tips
• Check the depth of the water before d riving throug h it.
• Do not stop the vehicle, d rive in revers e or switch the e ngine off
when driving through wate r.
• Keep in m ind that oncoming vehicles may c reate waves t hat raise
the water leve l and make it too deep for yo ur vehicle to drive throug h
sa fely.
• Avoid driving through salt water because it can ca use corros io n.
Operate your vehicle economically
and minimize pollution
General
You r personal style of driving will determi ne the econom y
of your vehicle, as well as exhaust and noise l evels.
Fuel economy, environmenta l impact, and wea r on your eng ine,
brakes and tires largely depend on t hree factors:
• your persona l dr iving style
• operati ng conditions
• t echni cal lim itations
If you an ticipa te what you need to do next and drive economically,
you can easily cut your fuel consumption by 10-15 percent. This
s e ct io n w ill give you so me tip s on how you can he lp the e nvir onme nt
and your pocketbook.
~
Vehicle care Do-it-yourself service Technical data

Driving and environment
(I] Tip s
The consumption estimates as pub lished by ENV IRONMENTAL
PROTECTION AGENCY (EPA) and Transport Canada may not corre­
spond to your actual consumption on the road, which will vary
depending upon vehicle load and speed, road and weather conditions,
trip length, etc. •
Drive smoothly and keep a lookout ahead
Vehicles use the most fuel when they are accelerating .
-Avo id unnecessary accelerating and braking.
Vehicles use the most fue l when they a re accele rating. If you antici­
pate what is going to happen next, you will need to brake less and,
thus, accelerate less. Let the vehicle coast whenever possible -for
example when you see that the next traffic l ight is red. •
Avoid full throttle
Driving at moderate speeds saves fuel and improves your
mileage.
- Try and keep well below your car's maximum speed .
Accelerating gently reduces fuel consumption, engine wear, and does
not disturb the environment.
Fuel consumption, exhaust emissions and engine noise increase
disproportionately at high speeds . If you drive at approx imately three
qua rters of top speed, fuel consumption will be reduced by one half.
Never drive faster than the posted speed limit and weather condi­
tions permit.
a Reducing unnecessary idling
Even when your car is just idling it burns up fuel.
-
Shut the engine off when yo u are not driving the vehicle.
- Do not warm up the vehic le by letting the eng ine run at
idle.
It makes sense to shut off the engine in traffic jams, when waiting for
trains to pass at rai lroad crossings, o r at traffic lights that have long
wa its on red . Turn ing the eng ine off for just 30-40 seconds saves
more fuel than is burned starting the engine again.
It takes a long t ime for the engine to warm up fully when it is running
at idle. Howeve r, wear and noxious emissions are espec ially high
when the eng ine is wa rm ing up. So you sho uld d rive away as soon as
you start the engine and avoid running at hig h rpms while the eng ine
is still warming up.
0 Note
Do not leave engine idling unattended after starting . If warning
lights should come on to indicate improper operation, they would go
unheeded. Extended idling also produces heat, which cou ld result in
overheat ing o r othe r damage to the vehicle or other p roperty. •
Regular maintenanc_e ____________ _
A badly tuned engine unnecessarily wastes a lot of fuel .
- Have your vehicle serviced at regular intervals .
By having yo ur vehicle regularly se rviced by an Audi dealer helps to
ensure that it runs properly and economically . T he condition of your
vehicle not only a ffects its safety and ability to ho ld its va lue, it a lso
affects
fu el con sumption .
Check your o il e ach tim e you fill you r tank.
~

Driving and environment
------------------------------------------------'
The amount of oil used is related to engine load and speed.
It is normal for the oil consumption of a new engine to reach its
lowest value after a certain mileage has been driven .
You must drive your vehicle about 3,000 miles (5,000 kilometers)
before you can properly assess oil consumption.
This also applies to fuel consumption and engine output .
0 Note
• Have your vehicle maintained properly and in accordance with the
service recommendations in your Warranty
& Maintenance booklet.
Lack of proper maintenance as well as improper use of the vehicle w ill
impair the function of the emission control system and cou ld lead to
damage.
• Do not alter or remove any component of the Emission Control
System un less approved by the manufacturer.
• Do not a lter or remove any device, such as heat shie lds, switches,
ignition wires, valves, which are designed to protect your vehicle's Emission Contro l System and other important vehicle components. •
Fewer short trips
Fuel consumption will always be relatively high on short
trips .
-Try to avoid driving short distances with a cold engine.
The eng ine and catalytic converter have to reach thei r optima l oper­
ating temperature
to reduce fuel consumption and noxio us em is­
sions effectively.
Just after starting, a cold engine in a mid -size car only achieves a fuel
economy of 6-8 miles per gallon (30-40 l/100 km) . After about a half
a mile, fuel economy climbs to 12 mpg (20 l/100 km). After about
2.5 miles (4 km), the engine is at its proper operating temperature
Controls and equip­
ment Safety first Vehicle operation
and fuel economy has
reached a normal level. So you can see that you
should avoid short trips whenever possible.
The
outside temperature is also cr it ical in th is regard . Your car
consumes more fuel in the winter than in the summer. •
Vehicle care Do-it-yourself service Technical data

Operating instructions
Maximum trailer weight
A trailer for your vehicle is limited to a typical class 1 or class 2 trailer.
Trailer load distribution
Be sure the load in the trailer is held securely in place to prevent it
from shifting forward, backward or sideways.
Never allow a passenger to ride in a trailer=>
& in "Driving instruc­
tions".
Engine cooling system
Towing a trailer makes the engine work harder. It is important that
the cooling system's performance is up to the additional load. Make
sure that the cooling system has enough fluid.
Tire pressure
When towing a trailer, inflate the tires of your vehicle to the cold tire
pressure listed under "Full load" on the label located either on the
driver's side B -pillar (visible when the door is open) or inside the fuel
filler flap. Inflate trailer tires to trailer and tire manufacturers' spec­
ifications .
Lights
The headlight settings should be checked with the trailer attached
before driving off. Check to make sure both vehicle and trailer lights
are working properly.
Safety chains
Be sure trailer safety chains are properly connected from the trailer
to the hitch on the vehicle. Leave enough slack in the chains to permit
turning corners . When you install safety chains, make sure they will
not drag on the road when you are driving.
The chains should cross under the trailer tongue to prevent it from
dropping in case of separation from the hitch .
Controls and equip­ ment Safety first Vehicle operation
Trailer
towingL_,1!:::!:·~-
0 Note
If you are going to tow a trailer, you must activate the trailer opera­
tion mode =>
page 179, "Towing a Trailer". •
Driving instructions
Driving with a trailer always requires extra care and
consideration .
To obtain the best possible handling of vehicle and trailer,
please note the following:
- Do not tow a loaded trailer when your car itself is not
loaded.
- Be especially careful when passing other vehicles.
- Observe speed limits.
- Do not drive at the maximum permissible speed.
- Always apply brakes early .
- Monitor the temperature gauge.
Weight distribution
Towing a loaded trailer with an empty car results in a highly unstable
distribution of weight. If this cannot be avoided, drive at very low
speeds only to avoid the risk of losing steering control.
A "balanced" rig is easier to operate and control. This means that the
tow vehicle should be loaded to the extent possible and permissible,
while keeping the trailer as light as possible under the circumstances.
Whenever possible, transfer some cargo to the luggage compart­
ment of the tow vehicle while observing tongue load requirements
and vehicle loading considerations.
Vehicle care Do-it-yourself service Technical data

Trailer towing
"---------------------------------------------------
Speed
T he higher the speed, the more difficult it becomes for the driver to
control the rig. Do not dr ive at the max imum permiss ible speed.
Reduce your speed even more if load, weather or wind conditions are
unfavorable -part icu larly when go ing downhill.
Reduce vehicle speed
immediately if the tra iler shows the slightest
sign of swaying.
Do not try to stop the swaying by accelerating.
Observe speed limits. In some areas, speeds for veh icles towing
trailers are lower than for regu lar vehicles.
Always apply brakes early. When driv ing dow nhill, shift in to a lower
gear to use the eng ine braking effect to slow the veh icle. Use of the
bra kes alone can cause them to overheat and fail.
Coolant temperature
Th e coolant temperature gauge~ page 10 must be observed care­
fully. If the needle moves close to the upper end of the scale, reduce
speed immediately and/or turn off the air conditioner.
If the coolant temperature warning light in the instrument cluster
starts flashing
_f_ , pull off the road, stop and let the engine idle for
about two m inutes to prevent heat build-up.
& WARNING
Anyone not properly restrained in a moving vehicle is at a much
greater risk in an accident. Never let anyone ride in your car who is
not properly wearing the restraints provided by Audi.•
Trailer towing tips
Important to know
------------
Your vehicle handles differently when tow ing a trailer because of the
additiona l weight and different weight distribution. Safety, perfor- mance and economy will greatly depend on how carefully you load
your trailer and operate your rig.
Before you actually tow your trailer, practice turning, stopp ing and
backing up in an area away from traffic. Keep practicing until you have
become completely familiar with the way your vehicle-t railer comb i­
nation behaves and responds.
Backing up is difficult and requires practice. Backing up with a trailer
generally requires steering action oppos ite to that when backing up
your vehicle without a trai ler.
Maintain a greater distance between your vehicle and the one in front
of you. You will need more room to stop. To compensate for the
trailer, you will need a larger than normal turning radius .
When passing, remember that you cannot accelerate as fast as you normally would because of the added load . Make sure you have
enoug h room to pass. After passing, allow plenty of room for your
trai ler before changing lanes again.
Avoid jerky sta rts, sharp tur ns or rapid lane changes.
W Tips
• Do not tow a trailer during the break-in per iod of your veh icle.
• If you tow a trai ler, your Audi may require more frequent mainte­
nance due to the extra load
~ page 361. •
Parking on a slope
Do not park on a slope with a trailer. If it cannot be
avoided, do so only after doing the following:
When parking:
- Apply the foot brake.
- Have someone p lace chocks under both the vehicle and the
trailer wheels . ._

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Cleaning and protection
General information
Regular care preserves vehicl e val ue.
Any automobile is exposed to industria l fumes, co rrosive road salt,
m ud dy dog fee t, e tc. A well c ared for Audi can look like new many
years after p urchase . Regular and correct care will contribute to
m aint aining the bea uty and val ue of your Audi.
Furthermore, good care may be a condition for substantiating a
warranty claim should corrosion damage or paint defects occur.
Y ou r au thor ized Audi d eale r h as a var iety of dedicated vehicle-care
products
and can advise w hich ones to use for clea ning the exterior
a n d inter io r of your ve hicle.
W het her you use products recommended by Aud i or o ther comme r­
cia lly availab le cleaning agents , please ma ke sure yo u appl y them
co rrectly .
& WARNING
• Cleaning agents may be poisonous . Keep them out of the reach
of children.
• Heed all caution labels .
• Always read directions on the container before using any
product. Follow the directions carefully.
• Most chemical cleaners are concentrated and have to be
diluted .
• Use spot removing fluids only in well ventilated areas.
• Do not use gasoline, kero sene , diesel fuel , nail polish remover
or other volatile fluids . They may be toxic, flammable or
hazardous in other ways. Do not wash, wax or dry the vehicle with
the ignition on or the engine running.
& WARNING (co ntinued)
• Do not clean the under sides of chassi s, fenders , wheel covers,
etc. without protecting your hands and arms. You may cut your­
self on sharp-edged metal parts.
• Moisture and ice on brakes may impair braking efficiency
~ page 254, "General information ". Test the brakes carefully
each time you wash the vehicle .
'£> For the sake of the environment
Select only envir onmenta lly fr iendly clea ning produc ts . Leftover
cleaning pro ducts sho uld not dis posed of i n the household waste .•
Care of exterior
Washing
F re qu ent w ashin g protec ts th e vehicl e.
T he best protection aga inst env ironmental influences is frequent
w ashi ng and w ax ing. How o ften t his is requ ired depen ds on:
• How m uch the vehicle is use d
• Whe re the ve hicle is parke d (gar age, in the o pen un der tr ees, e tc.)
• The seasona l and weather conditions
• E nviron mental influences
T he longer bi rd droppings , insects , tree resin, road and industria l
gr ime, t ar, soo t, road sa lt and o ther ma ter ia ls remain on the veh icle
body, the more lasti ng their destructive effects w ill be. H igh temper­
atu res cause d by ex pos ure to intense s unlight int ensify the co rrosive
effect, part icu larly when humid ity is high as we ll.
~

-Cleaning and protection pn,,._____ _ __,____ ____________ _
0 Note
• Never try to remove dirt, mud o r d ust if the s urface of the vehicle
is dry. Never use a dry cloth or sponge, s ince this could scratch your
veh icle's pai nt o r win dows.
• Never was h your car in bright sunlight . D rops of water act as
magnifyi ng lenses and may damage your p aint.
• When you was h yo ur car in the winter: if you rinse your vehicle w ith
a hose , be careful not to a im the stream of wate r d irect ly at locks, or
at doo r or hatch openings -they can freeze s hut.
• N ever use sponges des igned to remove insects, o r any kitchen
sco uring sponges or s imilar pro ducts. They can damage yo ur paint
fi ni sh.
• N ever use a dry cl oth o r sp on ge to clean t he he adlig hts. Only use
wet cloths or sponges to prevent scratches . It is best to use soapy
water .
• You shou ld remove debr is (s uch as insects) from the head light
lenses o n a regu lar b asis, for examp le w hen re fue ling your veh icle.
N ever clean the headlights w ith a dry clot h or sponge . Use a wet cloth
or sponge. It is best to use soapy water.
c£> For the sake of the environment
In the interest of the environment, the ve hicl e should on ly be washed
in spe cial wash bays .•
Washing your vehicle with a power washer
C le aning the exterior of y our car wit h a hi gh-pressur e
p ower washe r is s afe as long as you observe a few simple
r ul es .
- Before using t he power washer, make su re yo u have read
and und ers tood th e WARNI NGS =:::>
& in "General in for­
mation" o n
page 270. -
Always fo llow t he operat ing inst ructio ns for the power
washer .
- Make su re that t he jet o n th e sp ray hose produces a "fan
s ha ped spr ay".
- Do
not hold the spray nozz le too close to soft ma terials.
W hen cleaning the vehicle with a power washer always fo llow the
operat ing in str uctio ns. T his appli es p art icu larly to t he
operating
pressure
and the spraying distance . Maintain a suffic ient distance to
so ft ma ter ia ls s uch as rubbe r hoses an d so und/v ibration deaden ing
materials (part icular ly on the unde rside o f the engine hood) . Do not
use a jet wh ich sprays water in a
direct stream o r o ne that has a
rotating jet .
Water temperature sho uld not exceed 140
°F (60 °().
& WARNING
Never wash tires with a jet that sprays water in a direct stream .
This could cau se invisible damage to the tires and weaken them,
even if the spray i s from a relatively long distance and for a short
time . Damaged and weakened tires can fail and cause accidents
and personal injury.
0 Note
To avoid damaging your vehicle, always ma ke su re that there is suffi­
cien t dista nce between the spr ay head and sof t mate ria ls like r ubber
hoses, p lastic parts and sound-deadening mater ials. Never aim the
spr ay he ad at the s ame po int for a long t ime . This also ap plies to
cleaning headlights and pai nted b umpe rs. Remember : the close r the
noz zle is to the surfa ce of the mate rial, t he greate r the stress on the
material. •

____________________________________________ C_l_e _a_ n_ i n--= g=--- a_n_ d----' p,__ r_o _t_ e_ c_ t_ i _o_ n __ _
0 Note
• N ev er use che mical s olvents (e.g. lig hte r fl uid , turpen tine), waxe s,
sho e polish or sim ila r pr oducts on A lcantara ® surfaces.
• T o avo id damage, have s tubbor n sta ins removed by a co mmerc ia l
cleaning s pecialist .
• Do not use brushes, stiff spo nges or sim ilarly ab rasive cl ea ni ng
aids. •
Safety belts
Only well- maintain ed safe ty b elts wo rk re liably when
n ee ded.
- Kee p belts cle an.
- F or clea nin g, use a mil d soap and w ate r solution. Let belts
dry thor oug hly and aw ay fro m direct s unlig ht.
- D o not a llow i nertia re el sa fety b elt s t o re trac t bef ore the y
are c ompl ete ly dry .
- Che ck th e condi tio n of you r sa fety belts
regu larly.
H eav ily so iled safe ty be lts may not ret rac t proper ly.
& WARNING
Damaged safety belts can break in a crash.
• Anything that might damage your safety belts could mean
that you and your passengers would not be adequately protected
in an accident.
• Safety belt performance depends on correct installation. Never
remove belts from the vehicle to clean them .
• Do not use chemical cleaning agents , bleach or dyes. They have
corrosive properties which weaken the webbing.
Safety first
& WARNING (co ntinued )
• When cleaning your safety belts , inspect them for damage . If
you discover damage, see your Audi dealer .
• Always read and heed all WARNINGS and other information
~page 270. •
Engine compartment
Be es pec ially care ful w hen clean ing th e engine co mp art­
m en t.
Always switch off the ign ition before cleaning the engine~,&. .
Plenum panel
Remove leaves from the plenum pane l in front of the win dshi eld
under the eng ine hoo d. Thi s preven ts the wa ter d rain holes fro m
becoming blocked , and it prevents debris from enter ing t he veh icle
in ter ior thro ugh t he heat ing a nd ve ntilation ducts.
Corrosion protection
The e ng in e co mp artm ent a nd trans missio n have bee n co rros io n­
protected at the facto ry .
G ood ant i- corro sion t rea tmen t is very i mporta nt, pa rt icul arly in t he
wi nte r. If the ve hicle is freq uently d riven on sa lt treated roads, the
entire eng ine compartment and plenum pane l sho uld be tho rough ly
clea ned at the end of winter and retreated to preve nt salt damage. At
the same time, t he un derside of the vehi cle should be washed as well.
If the eng ine co mpartme nt is clean ed at any t ime wi th gre ase
remov ing so lutions
2
), or if you have the engine was hed, the anti­
cor rosion treat men t is almo st alw ays rem oved as well.
It is the refore
essential to have a long-last ing corrosion protection reapplied to all
s u rfaces, seams, jo ints and com ponents in the engine compartmen t.~
2> Us e on ly the co rrect clean ing so lut ions . Neve r use gaso line or diese l fue l.
Vehicle care Technical data

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in. WARNING
Be aware: The engine compartment of any motor vehicle is a
potentially hazardous area.
• Before working in the engine compartment, be sure to read the information =>
page 281.
• Before reaching into the front plenum panel, always remove
the ignition key . Otherwise, the windshield wiper system could
unintentionally be switched on, possibly causing personal injury
from the moving wiper linkage.
• Never reach into the area around or touch the radiator fan. The
auxiliary fan is temperature controlled and can switch on suddenly
- even when the ignition is off.
• Do not wash, wax or dry the engine with the engine running.
Moving or hot parts could injure you.
• Do not clean the underside of the chassis, fenders, wheel
covers, or other hard to reach parts without protecting your hands
and arms. You may cut yourself on sharp-edged metal parts.
• Always read and heed all WARNINGS and other information
=:> page 270. •