2018 AUDI A3 SEDAN engine

Check ing and F illing
Changing the engine oil
We recommend that have your oil changed by an
authorized Audi dealer or a qualified service sta­ tion.
Before you check anyth ing in the eng ine compart­
ment,
a lw ays re ad and h eed all WARNING S c> .&
in Working in the engine compartment on
page 318.
The engine oil must be changed accord ing to the
intervals specif ied in your Warranty
& Mainte­
nance booklet. This is very impo rtant because the
lubricat ing p ropert ies of o il d iminish gradually
du ring normal vehicle use.
Under some c ircumstances the eng ine o il should
be changed more frequently . Change oil more of­
ten if you d rive most ly short distances, ope rate
the vehicle in dusty areas or under predominant ly
stop -and-go traffic cond it ions, o r have yo ur vehi ­
cle where temperatures remain below freezing
for extended periods .
Detergent additives in the oil will make fresh o il
look da rk afte r th e e ng ine
has been run ning fo r a
short time. This is norma l and is not a reason to
change the oil more often than recommended.
Because of the prob lem of p roper d isposa l, along
with the special tools and necessa ry expe rt ise re ­
quired, we strong ly recommend that you have
your oil changed by an authorized
Audi dealer or
a qualified service station .
If you choo se to change your oil your self , please
note the fo llowing important information:
A WARNING
T o red uce the risk of personal injury if you
must c hange the engine oil in your veh icle
yourself:
- Wear eye protection .
-To reduce the risk of bu rns from ho t engine
oi l, let the engine cool down to the touch .
-
-When removing the o il drain pl ug with you r
fingers, stay as far away as possible . A lways
keep your forearm paralle l to the ground to
help prevent hot oi l from running down your
arm.
324
- Drain the oil into a container designed for
this purpose, one large enough to hold at
least the tota l amount of oil in your engine.
- Engine oil is poisonous. Keep it well out of
the reach of children.
- Continuous contact with used engine oi l is
harmf ul to your skin. Always protect your
skin by washing oil off thoroughly with soap
and water .
@ Note
Never mix oil additives with your engine oil.
These additives can damage your engine and
adverse ly affect your Audi Limited New Vehi­
cle Warranty .
{® For the sake of the environment
- Before chang ing your oi l, first make sure
you know where you can properly dispose of
the used oil.
- Always dispose of used eng ine o il properly.
Do not dump it on garden so il, wooded
areas, into open streams or down sewage
dra ins.
- Recycle used eng ine o il by tak ing it to a used
eng ine oi l collect ion fac il ity in your area, or
contact a service station .
Cooling system
Coolant
The engine cooling system is filled w ith a mixture
of purified water and coolant additive at the fac­
tory. This coolant must not be not changed.
The coo lant level is monitored thro ugh
the . in­
dicator light
c> page 25. However, we do recom­
mend occas ionally checking the coolant leve l
manually.
If you must add coo lant, use a mixture of water
and coolant additive . Mix ing the coo lant add itive
with dist illed water is recommended.
1111-

LL co .... N
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Coolant additive
The coolant additive is made of anti-freezing and
corrosion protection agents. Only use the follow ­
ing coolant additives . These additives may be
mixed with each other .
Coolant additive Specification
Gl3 TL 774 J
Gl2++ TL 774 G
The amount of coo lant add itive that needs to be
mixed with water depends on the climate where
the vehicle will be operated .
If the coolant addi­
tive percentage is too low, the coolant can freeze
and damage the engi ne.
Coolant Freeze protec-
additive tion
Warm min
.40% m in. -13 ° F
regions (-25 °C)
max. 45%
Cold min. 50% max . -40 °F
reg ions (-40 °C)
max. 55%
(D Note
- Before t he start of winter, have an author­
i zed Audi dealer or author ized Audi Se rvice
Facil ity check if the coolant additive in yo ur
vehicle matches the percentage appropriate
for the climate . Th is is especially important
when driving in co lder climates .
- If the appropriate coolant additive is not available in an emergency, do not add any
other additive. You co uld damage the en­
gine. If this happens, only use water and re­
store the correct mixture ratio with the
spec ified coolant additive as soon as possi­
ble .
- Only refill with new coo lant .
- Radiator sealant must not be mixed with
the coolant.
@ Tips
App lies to: RS models: In certain weather
conditions, moisture such as rain or snow may
evaporate on the rad iator after stopping the
Chec king and Filling
vehicle . This may cause s team to escape from
the front of the vehicle .
Adding coolant
Fig . 270 E ng in e co mpa rtment: ma rkings o n th e coo lant
expansio n
tan k
Observe the safety precautions r:::;, page 318,
Working in the engine compartment .
Checking the engin e coolant level
.,. Park the vehicle o n a level surface.
.,. Switch t he ignit ion off.
.,. Read the coolant level on the coolant expansion
tank
r:::;, fig. 2 70. The coolant level must be be­
tween the markings when the eng ine in cold .
W hen the eng ine is warm it can be slig htly
above the upper marking.
Adding coolant
Applies to: vehicles with plug-in hybrid drive:
your vehicle has two coolant expans ion tanks
that are separate from each other. The smaller of
the two expansion tanks must not be opened
r:::;, page 102. Read and follow the important safe­
ty preca utions
r:::;, .&. in Coolant on page 103 .
Requirement: there must be a residua l amount of
coolant in the expansion tank
c::> (D .
.,. Let the eng ine cool down.
.,. Place a cloth over the coolant expansion tank
cap and unscrew the cap counterclockw ise
c::> .&_ .
.,. Add coo lant m ixed in the cor rect ra tio
r:::;, page 324 up to the upper m arking .
.,. Make sure that the f lu id leve l remains stab le.
Ad d mo re coolant if necessa ry.
.,. Close the cap securely.
325

Checking and Filling
Coolan t loss usu ally indicates there is a leak. Im ­
m ed iately drive your v ehicle to an authorized
Aud i dea ler or authorized Aud i Serv ice Facility
and have the cooling system inspected. If the
coo ling system is not leaking, a loss can come
from the coolant boiling through overheating
and be ing pushed out of the cool ing system.
.&_ WARNING
- The coo ling system is under pressure . Do
not open the coolant expans ion tank cap
when the eng ine is ho t. This inc reases the
risk of burns .
- T he coo lant add itive and the coolant can be
d angerous to your healt h. For this reason,
keep the coolant in the origina l container
and away from children . There is a risk of
poisoning .
- When working in the engine compartment,
remember that the rad iator fan can switch
on even if the ign ition is switched off, which
increases the risk of in jury .
-
CD Note
Do not add coolant if the expansion tank is
empty . Air could enter the cooling system and
damage the engine. If this is the case , do not
cont inue driving. See an authorized Audi deal­
er or author ized Audi Service Facility for assis­
tance .
Brake fluid
Fig. 271 Eng in e co mpar tment : cap on b rake flu id r eservo ir
O bserve the safety precautions ¢ page 318,
Working in the engine compartment .
326
Checking the brake fluid level
Read the b rake fluid level on the br ake fluid res­
ervoir ¢ page 321, fig . 267. The brake f lu id leve l
must be between the MIN and MAX markings
¢ ,& .
The brake f lu id leve l is monito red automa tically .
Changing the brake fluid
Have the brake fluid changed regularly by an au ­
thorized Aud i dea ler or authorized Audi Service
Facility.
.&_ WARNING
- I f the b rake fl uid leve l is below the MIN
marking, i t can impair the bra king effec t
and driving safety, wh ich increase the r isk o f
an accident. Do not continue driving . See an
authorized A udi dealer or authorized A udi
Serv ice Facility fo r ass istance.
- If the brake fl uid is old, b ubbles may form
in the brake system dur ing heavy braking.
This would impair braking performance and
driving safety, which increases the risk of an
accident .
- To ensure the brake system functions cor­
rectly, only use brake fluids that comp ly
w ith VW standard S0 l 14 or
FMVSS- 116 DOT 4 .
CD Note
-If the brake f luid level is above the MAX
marking, brake fluid may leak o ut over the
edge of the reservoi r and result in damage
to the vehicle .
- Do not ge t any brake fl uid on the vehicle
pai nt, b ecause it w ill co rrode the paint .
Battery
General warnings about batteries
Because of t he comp lex power supp ly, all work
on batter ies such as d isconnecting, replacing ,
etc., shou ld
only be pe rformed by an authori zed
Audi dealer or authorized A udi Service Fac ility
¢ _& . ~

LL co .... N
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The term "vehicle battery" refers to the 12 Volt
batte ry in your vehicle.
Appl ies to: vehicles w ith plug-in hybrid drive: you
can find important informa tion abo ut yo ur high­
voltage battery in
r=> page 92.
Detail ed warning s for the vehicle battery :
~
Always wear eye protect ion .
&
Battery acid is high ly corrosive. Always
wea r protect ive g loves and eye protect ion .
.
®
Fire, spa rks, open flame and smoking are
forbidden .
A
A highly exp losive mixt ure of gases can
form when charging ba tte ries.
®
Always keep children far away from bat-
tery electrolyte and the battery .
~
Always follow the instructions in the oper -
ating manual.
A WARNING
All work on the battery or electrical system in
your vehicle can result in injuries, chemical burns, accidents or burns. Because of this, all
work m ust be perfo rmed
only by an author­
ized Aud i dea le r or autho rized Aud i Serv ice
Facili ty.
A WARNING
Cali fornia P roposi tion 65 Warn ing:
- Battery posts, termina ls and re lated acc es­
sories contain le ad and lead compounds,
c hem ica ls known to the St ate of C alifornia
to cause cance r and rep roductive problems.
Wash hands after handling.
(D Note
If the veh icle w ill be par ked for long periods
of t ime, pro tect it agains t the col d so that i t
w ill not be destroyed by "freezing"
q page 32 7, Charging the vehicle battery .
Checking and Filling
Charging the vehicle battery
Applies to: veh icles w ith vehicle battery in t he e ng in e com ­
partment
Fig . 272 En g in e co mpa rtm en t: c onnect ions for charge r
a nd j ump start c abl e
Applies to: vehicles w ith jump s ta rt point(+)
Fig . 2 73 Engin e compar tm ent: c onn ect io ns fo r charge r
a n d j ump s ta rt c able
Observe the safety precautions r=>page 318,
Working in the engine compartment .
Vehicles with plug-in hybrid drive*: r=> page 102,
Jump s tar t.
Requirement: only use chargers with a ma ximum
charging current of 30 amp s/14.8 Volt s.
The ve­
hicle battery cab les remain connected.
Depend ing on the engine, the battery is located
in the engine compartment or i n the l uggage
compartment. For vehicles w ith the battery in
the luggage compartment, a jump start point
that is also used for battery charg ing is located i n
the engine compartment . The battery is a lways
charged in the eng ine compartment. The g round
poin t
0 is always loca ted on the vehicle chass is .
.,. Read the warnings r=> .&.. in General warnings
about batteries on page 32 7
and r=> .&._.
.,. Switch off the ig nitio n and all electrical equ ip­
ment .
.,. Open the hood r=> page 320.
327

Check ing and F illing
~ Applies to: vehicles with the vehicle battery in
the engine compartment: open the battery cov­
er
¢ fig. 272 .
~ Applies to: vehicles with jump start point(+):
open the cover on the posi tive term inal
¢ fig . 273 .
~ Clamp the charger terminal clamps as instruct­
ed on the
p os itiv e t erminal (+ ) and only on the
bo dy ground p oin t(-).
~ Inse rt the powe r cable for the charg ing device
into the socket and switch the device on.
~ At the end of the charging process, switch the
charger off and pull the power cab le out of the
socket.
~ Remove the charger terminal clamps.
~ Applies to: vehicles with the vehicle battery in
the engine compartment: fold the cover back
on the battery correctly .
~ Applies to: vehicles with jump start point(+):
close t he cover on the positive term inal.
~ Close the hood ¢ page 320.
A WARNING
-A highly exp losive mixture of gases can form
when charging batteries . On ly charge the
vehicle battery in well -venti lated areas.
- A drained vehicle battery can freeze at tem ­
peratures around 32
QF (0 QC). A frozen or
thawed vehicle battery must not be charged
and must not be used anymore. If ice forms,
the battery housing can crack and battery electrolyte can leak out, which increases the
risk of a n explos ion and chemical burns .
Contact an autho rized Aud i deale r or au ­
tho rized Aud i Serv ice Facility fo r more info r­
mation .
-Do not connect o r disconne ct the c ha rg ing
cable while charg ing beca use th is increases
the risk of an exp losion.
(D Tips
-Only charge the vehicle battery through the
con nections in t he e ng ine compartment.
-Read all of the manufacture r's instructions
fo r th e cha rger befo re charg ing t he ve hicle
battery.
32 8
Windshield washer
system
Fig . 274 En gin e compar tmen t: w inds hield was he r fl ui d
cove r (example)
Observe the safety precautions ¢ page 318 ,
Working in the engine compartment .
M N
-N
"' "' m
The windshield washer fluid reservo ir W contains
the cleaning solution for the w indshield and the
headlight washer system*
¢ page 321, fig . 267 .
The reservoir capacity can be found in
¢page 382.
To reduce the risk of lime scale depos its on the
sp ray nozzles, use clean water with low amounts
of calcium . Always add w indow cleaner to the wa­
ter . When the outside temperatures are cold , an
ant i-freez ing agent sho uld be added to t he wate r
so that it does no t freeze.
@ Note
-Th e concentration of ant i-freez ing agent
must be adjusted to t he ve hicle operat ing
c ondi tions i n the respective clima te . A con ­
centration t hat is too high can lead to vehi ­
cle damage .
-Never add radia to r an ti- free ze o r o ther ad di­
t ives to the washer fluid.
-Do not use a glass clea ner th at conta ins
paint so lvents, because t his could damage
the paint.
Service interval display
The service interval display detects when your ve ­
hicle is due for service .
The service interval display works in two stages: .,.

Wheels
-The tire must flex more if the
tire pressure is too low or if
the vehicle speed or load are
too high. This heats the tire up
too much. This increases the
risk of an accident because it
can cause the tire to burst and
result in loss of vehicle con­
trol.
-Incorrect tire pressure in­ creases tire wear and has a
Tire pressure table
Please note that the information
contained in the following table
was correct at the time of print­
ing, and the information is sub­
ject to change. If there are differ­
ences between this information
and the tire pressures specified
on the label on the driver's side B­
pillar, always follow the specifica­
tion on the B-pillar label
c> page 341 , fig. 2 77.
Model/ Tire designation
negative effect on driving and
braking behavior, which in­
creases the risk of an accident.
@ Note
Replace lost valve caps to re­
duce the risk of damage to the
tire valves.
@ For the sake of the environment
Tire pressure that is too low in­ creases fuel consumption.
Make sure that the tire designa­
tion on your tire matches the des­
ignation on the tire pressure label
and the tire pressure table.
The following table lists recom­ mended tire pressures in cold
tires according to the load and
the size of the tires installed.
Tire pressure
Engine Normal load Maximum load
(up to 2/3*
people)al
front rear front rear
PSI kPA PSI kPA PSI kPA PSI kPA
A3 sedan: 225/40 R18 92Y 35 240 32 220 36 250 36 250
2.0 L
225/45 R17 91H 33 230 30 210 41 280 41
280
4-cylinder
225/40 R18 92H 36 250 33 230 41
280 41 280
235/35 R19 91 Y 33 230 30 210 38 260 41 280
342

u. 00 .-<
Wheels
Model/ Tire designation Tire pressure
Engine Normal load Maximum load
(up to 2/3*
people)a>
front rear front rear
PSI kPA PSI kPA PSI kPA PSI kPA
S3 sedan: 225/40 Rl8 92Y
38 260 35 240 42 290 42 290
2.0 L
225/40 Rl8 92H 38 260 35 240 41
280 41
280
4-cylinder
235/35 Rl9 91 Y 39 270 36 250 44 300 44 300
RS 3 Sedan: 235/35 Rl9 91 Y 39/ 270/ 35/ 240/ 44/ 300/ 39/ 270/
2.5 L 44b) 300b) 39b) 270b ) 45b) 320b) 44b) 300b)
5-cylinder
255/30 Rl9 91 Y 39/ 270/ --44/ 300/ --
44b) 3oob> 45b) 320 b)
A3 Cabriolet: 225/40 Rl8 92Y 35 240 32 220 38 260 38 260
2.0 L
225/45 Rl7 91H 33 230 30 210 39 270
39 270
4-cylinder
225/40 Rl8 92H 38 260 35 240 41 280 41 280
235/35 Rl9 91 Y 42
290 39 270
45
310 45
310
A3 Sportback 205/55 Rl6 91 V 35 240 35 240 36 250 39 270
e-tron:
225/40 Rl8 92Y 33 230 33 230 36 250 39 270
1.4 l 225/45 Rl7 91H 33
230 33 230 38 260 38 260
4-cylinder
225/40 Rl8 92H
36 250 36 250 41
280 41
280
a) Vehicles with 4 seating positions: two people in the front, Vehicles with S seating
positions:
two peop le in the front, one person in the rear
b) The value before the forward slash applies to vehicles with a maximum speed up to
155 mph (250 km/h) ; the value after
the· slash is for up to 174 mph (280 km/h).
A WARNING
Please note the important safe­
ty precautions regarding tire
pressure
c:::> page 341 and load
Lim its
c:::> page 343.
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 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.
~ well and is more difficult to stop. 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
.-<
~ Overloading can not only lead to
00
technically referred to as the ..,
343

u. 00 .-< N l'­ N .-< 0 N > 00
A WARNING
-The tire pressure monitoring system assists
the driver in monitoring tire pressures . The
driver is responsible for having the tires in­
flated to the correct pressure.
- Do not change the tire pressure when the
temperature of the tire is extremely high.
This could result in serious damage to the
tire and even cause the tire to burst, in­
creasing the risk of an accident.
- A tire with low pressure flexes more. This
heats the tire up too much. This could cause
the tread to separate and even cause the
tire to burst, increasing the risk of an acci­
dent.
- The tire pressure monitoring system does
not warn about damage or defects in the
tire construction that could cause the tire to burst, for example . Inspect your tires regu­
larly .
(D Tips
-If tires are replaced, the sensors/valves do
not need to be removed or replaced. Just re­
placed the valve stem and, if necessary, the
valve and the wheel electronics. If you have
questions, see an authorized Audi dealer or
authorized Audi Service Facility .
- An incorrect display or a malfunction in the
tire pressure monitoring system can occur
after using the tire mobility kit . Have the
sensors replaced by an authorized Audi
dealer or authorized Audi Service Facility.
- For an explanation on conformity with the
FCC regulations in the United States and the
Industry Canada regulations, see
r=;,page 386.
Displaying tire pressures/temperatures
Applies to: vehicles with tire pressure mo nito ring system
Requirement: you must be driving the vehicle.
"'Select in the Infotainment system: the I MENU I
button > Vehicle > left control button > Service
& checks > Tire pressure monitoring > Display
tire pressures.
Wheels
The current tire pressures are shown in green,
yellow or red numbers in the Infotainment sys­
tem:
- Green: the current tire pressure and the speci­
fied tire pressure are approximately the same.
- Yellow: the current tire pressure is too low
compared to the specified tire pressure.
-Red: the current tire pressure is extremely low
compared to the specified tire pressure .
The specified tire pressure is the last tire pres­
sure that was stored
r=;, page 352.
Note that the tire pressure also depends on the
temperature of the tire. The tire pressure in ­
creases as the engine becomes warmer while
driving.
A WARNING
Read and follow the important information
and notes
"*page 350.
(D Tips
The tire pressure or temperature is not dis­
played while the vehicle is stationary and in
adaptation mode. Dashes--.-- are shown in
place of the pressure and temperature.
ill Tire pressure loss
Applies to: vehicles with tire press ure mo nito ring system
-
If the [tE indicator light turns on, the pressure in
at least one tire is too low or new sensors were
not adapted:
RE Indicator light turns on after turning the
ignition on
The tire pressure is too low compared to the
specified pressure .
.,. Check and store the tire pressure(s) the next
time it is possible
"*page 352.
RE Indicator light turns on while driving
Wheels with new sensors were not adapted or
the tire pressure has reached a critical level com­
pared to the specified pressure.
"'Avoid unnecessary steering and braking maneu-
vers.
..,_
351