2015 AUDI TT ROADSTER light

160 Fuel supply and filling your fuel tank
Fuel supply and filling
your fuel tank
Gasoline
Fuel supply
Using the right fuel helps keep the environ­
ment clean and prevents engine damage .
Fuel recommendation
The fuel recommended for your vehicle is un­
leaded premium
grade gasoline . Audi recom­
mends using TOP TIER Detergent Gasoline
with a minimum octane rating of 91 AKI (95
RON) . For more information on TOP TIER De­
tergent Gasoline, please go to the official
website (www.toptiergas.com).
The recommended gasoline octane rating for
your engine can also be found on a label locat­
ed on the inside of the fuel filler flap. This rat­
ing may be specified as AKI or RON.
Your vehicle may also be operated using un­ leaded regular gasoline with a minimum oc­
tane rating of 87 AKI/91 RON. However, using
87 AKl/91 RON octane fuel will slightly re­
duce engine performance.
Use unleaded gasoline only. Unleaded gaso­
line is available throughout the USA, Canada,
and in most European countries. We recom­ mend that you do not take your vehicle to
areas or countries where unleaded gasoline
may not be available.
For more information on refueling your vehi­
cle, see ¢
page 161.
Octane rating
Octane rating indicates a gasoline's ability to
resist engine damaging "knock" caused by
premature ignition and detonation. Therefore,
buying the correct grade of gasoline is very
important to help prevent possible engine
damage and a loss of engine performance.
Gasoline most commonly used in the United
States and Canada has the following octane ratings that can usually be found on the filler
pump : -
Premium Grade: 91 -96 AKI
- Regular Grade: 87 -90 AKI
Explanation of the abbreviations:
AKI= Anti Knock Index= (R+M)/2 = (RON
+MON)/2
RON= Research Octane Number
MON = Motor Octane Number .
@ Note
-Do not use any fuel with octane ratings
lower than 87 AKI or 91 RON otherwise
expensive engine damage will occur.
- Do
not use leaded gasoline! The use of
leaded gasoline will severely damage
your vehicle's catalytic converter and its
ability to control exhaust emissions.
Blended gasoline
Use of gasoline containing alcohol or
MTBE (methyl tertiary butyl ether)
You may use unleaded gasoline blended with
alcohol or MTBE (commonly referred to as
oxygenates) if the blended mixture meets the
following criteria:
Blend of gasoline methanol (wood alcohol or
methyl alcohol)
- Anti-knock index must be 87 AKI or higher.
- Blend must contain no more than 3% meth-
anol.
- Blend must contain more than 2% co-sol-
vents.
Blend of gasoline and ethanol (grain alcohol
or ethyl alcohol)
- Anti-knock index must be 87 AKI or higher.
- Blend must not contain more than 10%
ethanol.
Blend of gasoline and MTBE
- Anti-knock index must be 87 AKI or higher.
- Blend must contain not more than 15%
MTBE.
Seasonally adjusted gasoline

164 Checking and filling
Checking and filling
Engine hood
Releasing the engine hood
The engine hood is released from inside the
vehicle .
Fig. 126 Driver' s side footwe ll: e ngin e hood release
lever
.. Open the driver's door .
.. Pull the release lever on the left under the
instrument panel
c> fig . 126 in the direction
of the arrow .
The hood pops up slight ly under spring pres­
sure.
Opening the engine hood
Fig . 127 Re lease lever under the engine hood
Before opening the engine hood, make sure
that the windshie ld wipers are flat against the
windshie ld. Otherwise, they cou ld damage the
pain t on the hood.
.. Lift the hood slight ly
c> .&, .
.. Pull up on the release under the hood
c> fig . 12 7. This releases the catch .
.. Open the hood all the way.
A WARNING
-Hot engine coolant can burn you.
- To reduce the risk of being burned, never
open the hood if you see or hear steam
or coo lant escaping from the eng ine
compartment . Wait unt il no steam or
coolant can be seen or heard before care­
fu lly opening the hood.
Closing the engine hood
.. Pull the hood down until the pressure from
the struts is reduced .
.. Let the hood
drop down and latch in p lace.
Do not try to push it shut; it may fail to en­
gage
c> .&, .
A WARNING
--
A hood that is not completely latched
could fly up and b lock your view while dr iv­
i ng.
- When you close the engine hood, check it
to make sure the safety catch has proper­
ly engaged . The hood should be flush
with the surrounding vehicle body parts.
- If you notice while dr iv ing that the hood
is not secured properly, stop at once and
close it .
Working in the engine compartment
Be especially careful whenever you work in
the engine compartment!
Whene ve r y ou must pe rform any wo rk in th e
eng ine compartment, for e xample chec king
and filling the diff ere nt fluids, ther e is a risk
of injury , burn s and accident s. To prevent
p ers onal injury alwa ys obs erv e the follo win g
WARNING S. Th e engin e c ompartm ent of an y
v e hicl e is a hazardou s area!
c> .&.
A WARNING
To help avoid injury, before you check any­
thing under the hood:
- Sw itch off the engine .
- Remove the ignition key.

166 Checking and filling
Engine compartment
These are the most important items that you can check .
•
Fig. 128 Typ ica l layout for containers and eng ine oil filler cap
CD Coolant expansion tank (-L) .. .
'2' E . 'l d. . k \61 ngIne 0 1 1pst1c .......... .
@ Engine oil filler cap ('1:::r.) .. .. .
@ Brake fluid reservoir((();) .. .. .
® Jump start points(+) under a
cover, (-) bolt head .... ... .. .
® Windshield/headlight washer
t . (
;;p, ) con ainer ,-!,, •••.•••.•.•••.
172
169
169
174
217
179
The pos ition of the engine o il dipstick and the
engine o il fi lling hole
r::> fig. 128 (items @and
@) can differ depending on the engine de­
sign .
A WARNING
Before you check anything in the engine
compartment, always read and heed all
WARN INGS
c::> .& in Working in the engine
compartment on page 164.
Engine oil
Engine oil specifications
The engine in your Audi needs the right kind
of oil.
T he eng ine in your Aud i is a soph ist icated
powerplant that was built to exact ing spec ifi­
cat ions . T his engine needs the right kind of
engine oil that meets specifications regarding
quality and viscosity so that it can run
smooth ly and reliably . Choosing the right o il
and changing oil within the time and mileage
i ntervals printed in your vehicle's Warranty
&
Maintenance booklet matters a lot more to­
day tha n it did years ago. Audi has developed
a spec ia l quality standard for engine oil that
will help assure that you r vehicle's engine w ill
get the lubr ication it needs fo r proper opera­
t ion.
Modern engine lubr ication has taken a quan­
tum leap in the last few years. Many synthet ic
1J.

168 Checking and filling
Detergent additives in the o il will make fresh
oil look dark after the engine has been run­
n ing for a short time . This is norma l and is not
a reason to change the oil more often than recommended.
D am ag e o r m alfun ction s due to lack of
m ainten ance
It is essent ial that yo u change your oil at the
recommended intervals using only engine oil
that complies with Audi oi l standard
VW 502 00 . Your Lim ited New Vehicle War­
ranty does not cover damage or malfunctions
due to failure to follow recommended mainte­
nance and use requ irements as set forth in
the Audi Owner's Manual and Warranty
&
M aintenance book let . Your dea ler will have to
deny warranty coverage un less you p resen t to
the dea ler proof in the form of Servi ce or Re­
pa ir Orde rs that all schedu led maintenance
was performed in a timely manner.
Engine oil consumption
The engine in your vehicle depends on an ade­
quate amount of oil to lubricate and cool all
of its moving ports.
I n o rder to prov ide effective lubr ication and
cooling of internal engine components, a ll in­
ternal comb ustion engines consume a certain
amount of oil. Oi l consumption varies from
engine to engine and may change significantly
over the life of the eng ine . Typically, eng ines
with a specif ied break-in per iod (see
c::> page 149) consume more oil during the
break-in per iod than they consume after oil
consumption has stabilized .
Under normal conditions, the rate of oil con­
sumpt io n depends on the quality and viscosity
of the oil, the RPM (revolutions per m inute) at
which the engine is operated, the ambient
temperature and road cond it io ns. Furthe r fac­
tors are the amo unt of o il d ilution from wate r
condensation or fuel residue and the ox ida­
tion level of the oi l. As any engine is subject to
wear as mileage bui lds up, the oil consump­
tion may increase over t ime until replacement
of worn components may become necessary. Wi
th a ll these variab les coming into p lay, no
standard rate of oil consumption can be es­
tab lished or spec ified. There is no alte rnative
to regular and frequent check ing of the o il lev­
el, see
Note .
If the yellow engine oil leve l warning symbo l
in the instr ument cluster
1\1 lights up, you
sho uld check the oil leve l as soon as possib le
with the oil dipstick c::> page 169. Top off the
o il at your earliest conven ience
c::> page 169 .
A WARNING
-Before you chec k anything in the eng ine
compartment, a lways read and heed a ll
WAR NINGS
c::> .& in Working in the engine
comportment on page 164.
CI) Note
D riving with an insufficient o il level is like­
l y to cause sever e damage to the engine.
(D Tips
- The oil pressure warn ing display. is
not an indicator of the oil level. Do not
rely on it . Instead, check the oil level in
your engine at r egular intervals, pr ef­
erably ea ch time you refuel, and alway s
before going on a long trip.
- If you have the impression yo ur engine
cons umes excessive amoun ts of oil, we
recommend that you consult your Aud i
dea ler to have the cause of your concern
properly diagnosed. Keep in mind that
the accurate meas urement of o il con­
sumption requires great care and may
take some t ime . Your Audi dea ler has in­
st ruct ions about how to measure oil con­
sumption acc urately.

172 Checking and filling
Checking the engine coolant level
The engine coolant level can be checked with
a quick glance.
F ig. 132 Eng ine compartme nt: cover on the coo lant
expansion tank
Before you check anything in the engine com­
partment,
a lway s read and he ed a ll WARN­
ING S o .A in Working in the engine compart­
ment on page 164.
., Park your vehicle on a level surface.
., Switch the ign ition
off .
., Read the coolant level at the coolant expan­
sion tank
opage 166, fig . 128. With a cold
engi ne, it must be above the "min" mark.
With a hot engine, it can be a l ittle above
the indicated range.
The location of the coolant expans ion tank
can be seen in the engine compartment illus­
tration
o page 166.
To obtain an accurate read ing, the eng ine
must be sw itched
off.
The expans ion 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
opage 17will
illum inate until you add coolant and the level
has been restored to normal. Even thoug h
there is an electric coolant level sensor, we
still recommend you check the coolant leve l
from time to t ime.
Coolant lo ss
Coolant loss may indicate a leak in the cooling
system. In the event of coolant loss, the cool­
ing system should be inspected immediately by your authorized Audi dea
ler .
It is not
enough merely to add coo lant .
In a
seal ed system, losses can occu r on ly if
the boi ling po int o f the coo lan t is exceeded as
a res ult of overheating.
(D Note
Do n ot add any type o f radiator leak se al­
ant to your veh icle's engine coo lant. Add ­
i ng radiator repa ir fl uid may adverse ly af ­
fect the functio n and performance of you r
cooling system and could result in damage
not cove red by your New Veh icle l imited
Warranty.
Adding coolant
Be very careful when adding engine coolant.
Before you check anyth ing in the engine com ­
partment,
a lways read and heed all WARN­
INGS o .A in Working in the engine compart­
ment on page 164.
Req uirement: There m ust be a res idual
amount of coo lant in the expansio n tank
o (D .
., Tur n off the engi ne .
., le t t he eng ine cool down.
., Place a thick rag ove r the coolant expansion
tank
o page 172, fig. 132 and carefully
twist the cap counter-clockwise o _A .
., Add coolant m ixed in the correct ratio
o page 171, Coolant up to the MAX mark­
ing.
.. Make sure that the flu id level remains sta-
b le. Add more coo lant if necessary.
., Twi st the cap o n aga in
tightly.
Replacement engine coo lant must conform to
exact spec ificat ions
o page 171, Coolant .
We recommend using only coolant addit ive
Gl2++, Gl3 or in an emergency Gl2+. Do
not
use a different add itive . In an emergency use
plain water until you can get the co rrect addi­
t ive and can resto re the correct ratio. This
sho uld be done as soon as poss ib le.

17 4 Che cking and filling
Brake fluid
Checking brake fluid level
Fig . 133 Engine compa rtment: cove r on the brake fluid
reservo ir
Before you check anything in the engine com­
partment,
a lw ays read and h eed all WA RN­
ING S ¢&. in Working in the engine compart ­
ment on page 164.
,.. Read the brake fluid level from the brake
fluid reservoir¢
page 166, fig . 128. T he
brake flu id leve l must be between the "MIN"
and "MAX" markings.
The brake flu id rese rvo ir is located behind the
rear part ition of the eng ine compartment o n
the left side ¢
page 166.
The fluid level may drop slightly after some
time due to the automatic adjustment of the b rake pads . This is not cause for alarm.
If the brake fluid level falls
considerably be­
low the "MIN" mark, the brake warning/indi­
cator light (U.S. models: . , Canadian mod­
e ls: . ) w ill come on
¢page 14. Do not con­
tinue to operate the vehicle. The comp lete
brake system shou ld be thoroughly checked
by an authorized A udi dealer or other quali­
fied facility and the cause corrected.
If the
brake fluid level is too low, the brake warn ing/
indicator light w ill illuminate. Contact an au­
thor ized Audi dealer
imm ediatel y.
Changing brake fluid
Have the brake fluid changed by an experi­
enced technician .
Brake fluid absorbs moisture from the air. If
the water content in the brake fluid is too high, corrosion in the brake system may result
after a period of time . The boiling point of the
brake flu id will also decrease conside rably and
decrease braking pe rformance.
Therefore, the brake fluid must be changed
eve ry two y ears. Always use new brake flu id
which conforms to Federal Motor Veh icle
Standard "F MVSS 116 DOT 4".
The brake fluid reservoir can be diff icult to
reach, therefore, we recommend that you
have the brake fluid changed by your author­
ized
Audi dealer . Your dealer has the correct
tools, the right brake fl uid and the know -how
to do this for you.
A WARNING
- Brake fluid is poisonous . It must be stor­
ed only in the closed original container
out of the reach of children!
- Brake failure can resu lt from o ld or inap­
propriate brake flu id. Observe these pre­
cautions:
- Use only brake f luid that meets SA E
specifica tion
J 1 7 03 and conforms to
Federa l Moto r Ve hicl e Standard 1 16.
Always check with yo ur authorized Aud i
dealer to make sure yo u are using the
correct brake fluid. The correct type of brake f lu id is also ind icated on the
brake flu id 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
l ong. This can seriously affect the effi­
c iency of the brakes as well as your
safety. This cou ld resu lt in an accident.
(D Note
Brake fluid will damage the paint of your
vehicle .

@ For the sake of the environment
Because of the problem of proper disposa l
of brake flu id as we ll as the special tools
requ ired and the necessary expert ise, we
recommend that you have the brake fluid
changed by your author ized Audi dealer .
Battery
General information
Your vehicle is equipped with a special bat­
tery, an
ACM battery. This battery is located
in the luggage compartment and must be re­
p laced w ith an original equipment battery .
Under normal operati ng conditions, the bat­
tery is
maint enan ce -fre e.
Have the battery checked when you take your
ve hicle in for service. You are well adv ised to
replace a battery that is older than
5 years.
Di sconn ect ing the battery terminal s
Some vehicle functions (power window regu­
lators, for example) are lost if the battery ter­
minals are d isconnected. These functions have
to be re learned after the battery terminals are
connected again . To prevent this, the battery
should only be d isconnected from the vehicle
e lectr ica l system when absolutely necessary
for repairs .
Vehicles not driven for l ong period s
If you do not drive your vehicle over a period
of several days or weeks, electrical compo ­
nents are gradually cut back o r switched off .
This reduces energy consumption and main­
tains sta rting capab ility over a longer per iod
c::> page 146. Some of the convenience func­
tions may not operate, s uch as the interior
lights or power seat adjustment. The conven ­
ience functions will be avai lab le again when
you switch on the ignition and start the en­ g ine.
Winter operation
D uring the winter months, ba tte ry capaci ty
tends to decrease as temperatures d rop. This
is because more powe r is also consumed while
Checkin g and fillin g 175
starting, and the headlights, rear window de ­
fogger, etc ., are used more often .
Avoid unnecess ary powe r consumpt io n, p ar­
t icu lar ly in city traffic o r when traveling only
sho rt distances. Let your authorized A udi
dealer check the capacity of the vehicle bat­
tery before winter sets in
c::> page 178. A well
charged battery will not on ly prevent starting
problems when the weather is cold, but will
also last longer .
Replacing battery
The new battery must ha ve the same capaci ­
ty, voltage (12 volts), amperage, construction
and plug sea ling, as the original battery. Spec­
ifications are listed o n the battery housing.
Batter ies spec ia lly developed by Audi fulfill
the maintenance, outp ut, and safety require­
ments.
When installing the battery, make sure the ig­ nition and a ll electrical consumers are switch ­
ed off
c::> (D .
We recommend that you use maintenance­
free or
cycle -res istant /leak-proof batter ies
accord ing to the standards TL 825 06 (from
Apr il 2008) and VW 7 50 73 (from Ap ril
2010).
Rep lacing the battery should be carried by a
qualified workshop. Please fo llow the instruc ­
tions on the battery cover.
([) Note
-All work on the battery requ ires techn i­
cal know ledge. P lease contact an Audi
deale rship o r anot her au tho rized fac ility
for questions abo ut the batte ry -dang er
of a cid b urns and exp losion ha zard!
- T he battery must not be opened! Do not
try to cha nge the battery 's liquid level,
ot herwise de tona ting gas will esc ape
from the ba ttery -explosion ha zard!
- T he AGM battery in the l uggage com­
p artment cannot leak, because the elec­
tro lyte for this battery is abso rbed into a
special glass mat. This lea k-p roof battery
Iii>
•
•

176 Check ing and filling
must not be replace with a conventional
battery .
- Make sure the ventilat ion hose on the
side of the battery is connected, other­
wise fumes or battery acid can leak out.
- Battery ho lder and terminals a lways
have to be secured cor rectly.
- Befo re a ll work on the battery fo llow the
warning s below c::, & in Working on the
battery on page 176.
@ For the sake of the environment
Because of the problem of proper d isposa l
of a battery, we recommend your author ­
ized Au di dealer change the battery for
you. Batter ies contain su lf u ric ac id and
lead and m ust always be disposed of prop­
erly in compliance w ith all environmental
regulations . D isposing of vehicle batteries
improperly is very dangerous to the envi­
ronment. Make sure that the removed bat­
t ery cannot overbalan ce, o therw ise sulfu­
r ic acid mig ht escape!
Q Tips
If you r vehicle is left standing for severa l
weeks at extremely low tempe rat ures, t he
veh icle b attery should be remove d and
sto red whe re it will not freeze . This w ill
prevent it from being damage d and hav ing
to be replaced .
Working on the battery
Be especially careful when working on or near
the battery!
T he ba tte ry is loca ted in the luggage compart ­
men t under the floor . Before yo u work on or
near the battery,
read and heed all WARN­
INGS
c::, ,& .
Always heed the sa fet y warning s, when wor k­
ing on the vehicle battery o r the ve hicle elec ­
trica l system to preve nt injury.
The following WARNINGS are very
i mportant when working on the battery :
Alway s heed the followin g WARNING SYM·
BOLS and safety precaution s when working
on the battery.
®
Always wear eye protection .
~
Battery acid contains sulfuric acid . Al-
ways w ear glov es and eye prot ection.
@
No
- spa rks
- flames
- smo king.
~
When a batter y is charged, it produ ce s
hydrogen gas which is ex plosive and
could cau se pe rsonal injury.
®
Always keep the batt ery well out of
reach of childr en.
& WARNING ~ -
Wheneve r working on t he battery o r on
the electrical system, there is t he risk of
injury, accident and even fire . Read and
heed the following WARNINGS:
- Always wear eye protection. Do not let
battery ac id or any lead particles get on
your skin or clothing. Shield you r eyes.
Exp losive gases can cause blindness or
other injury.
- Battery acid conta ins sulfuric acid. Sulfu­
ric acid can ca use blindness and severe
burns.
- Always wear g loves and eye prote ction.
Do no t tilt the ba ttery because acid
could leak out of the ventilation open ­
ings .
- If you get battery ac id in your eyes or
on your skin, immediately rinse with
cold water for several minutes and get
med ica l attent ion.
- If you shou ld ingest any battery acid,
seek medical attention immediately .
- Do not expose the battery to an open
flame, e lectr ic sparks or an open light.
- Do not smoke .