2021 AUDI A4 fuel additives

8W1012721BC
Checking and Filling

Checking and Filling
Fuel
Types of gasoline
The correct gasoline grade is stated on the inside
of the fuel filler door.
The vehicle is equipped with a catalytic converter
and must only be driven with unleaded gasoline.
Audi recommends using TOP TIER Detergent Gas-
oline. For additional information on TOP TIER De-
tergent Gasoline, visit www.toptiergas.com.
The individual gasoline grades are differentiated
by octane ratings. This value is given with (R
+M)/2 equating to AKI or in RON.
The headings below match the sticker in the fuel
filler door (examples):
UNLEADED FUEL ONLY MIN. (R+M)/2 87
Regular / MIN. RON 91 Regular
Use regular gasoline with minimum 87 AKI /
91 RON > ©.
Audi recommends using premium gasoline with
minimum 91 AKI / 95 RON to achieve the rated
horsepower and torque.
UNLEADED FUEL ONLY PREMIUM MIN. (R
+M)/2 91 / SUPER MIN. RON 95
Using premium gasoline with minimum 91 AKI /
95 RON is recommended.
If premium gasoline is not available, you can also
use regular gasoline 87 AKI / 91 RON. However
this does reduce the engine power slightly.
UNLEADED FUEL ONLY PREMIUM MIN. (R
+M)/2 93 / SUPER PLUS MIN. RON 98
Using premium plus gasoline with at least 93
AKI / 98 RON is recommended.
If no premium plus gasoline is available, you can
also use premium gasoline with 91 AKI /95 RON.
However this does reduce the engine power
slightly.
CG) Note
— Filling the tank just one time with leaded
fuel or other metallic additives will cause
permanent deterioration to the catalytic
converter function.
— When gasoline with an octane rating that is
too low is used, high speeds or heavy engine
load can lead to engine damage.
@ Tips
The vehicle may be filled with fuel that has a
higher octane rating than what is required by
the engine.
Gasoline mixture
Gasoline with alcohol or MTBE (Methyl-Tert-
Butyl-Ether)
You can use unleaded gasoline mixed with alco-
hol or MTBE (generally labeled as oxygenated
compounds) as long as the fuel meets the follow-
ing conditions:
Gasoline with methanol content (methyl alco-
hol or methanol)
— Anti-Knock Index is at least 87 AKI
—No more than 3% methanol
— More than 2% solvent
Gasoline with ethanol content (ethyl alcohol or
ethanol)
— Anti-Knock Index is at least 87 AKI
—No more than 15% ethanol
Gasoline with MTBE content
— Anti-Knock Index is at least 87 AKI
—No more than 15% MTBE
Gasoline adapted to the season
Many gasoline fuels are adapted to the seasons.
When the season changes, refueling at high-traf-
fic gas stations is recommended. It is more likely
that the gasoline will be suitable for the season
there.
@) Note
— Gasoline with methanol content that does
not meet the specified conditions may cause >
217

Checking and Filling

corrosion damage and damage to plastic or
rubber components in the fuel system.
— Do not use gasoline that does not meet the
specifications.
— If you are unable to find out if a specific gas-
oline mixture meets the specifications, ask
the gas station operator or their fuel suppli-
er.
— Do not use any gasoline mixture whose
composition cannot be identified.
— Audi does not assume any responsibility for
damage to the fuel system or for perform-
ance problems caused by using gasoline
mixtures different from those specified.
This type of damage also does not fall under
the New Vehicle Limited Warranty or under
the emissions control system warranty.
— If you notice a higher fuel consumption or
poor handling or performance problems due
to such gasoline mixtures, Audi recom-
mends fueling with unblended gasoline.
Gasoline additives
An important issue for many automobile manu-
facturers is combustion residue in the engine
that results from the use of certain fuels.
Although types of gasoline differ depending on
the manufacturer, there are similarities. Certain
substances in the gasoline may cause deposits in
the engine. Additives in the gasoline that should
keep the engine and fuel system clean do not all
function equally.
Audi recommends using TOP TIER Detergent Gas-
oline. For additional information on TOP TIER De-
tergent Gasoline, visit www.toptiergas.com.
If you use incorrect fuels over a long period of
time, the maximum engine performance may be
impaired by combustion residue.
@ Note
— Damage or malfunctions caused by the use
of incorrect types of gasoline are not cov-
ered by the New Vehicle Limited Warranty.
— Only gasoline additives that have been ap-
proved by Audi may be used.
218

Refueling
Messages
FA tank system: malfunction! Please contact
Service
There is a malfunction in the fuel tank system.
Drive to an authorized Audi dealer or authorized
Audi Service Facility immediately to have the
malfunction corrected.
Fueling procedure

Fig. 153 Right rear side of the vehicle: opening the fuel
filler door

Fig. 154 Fuel filler door with attached fuel cap
The fuel filler door is unlocked or locked by the
central locking system.
> Unlock the vehicle if necessary.
> Press on the left side of the fuel filler door to
open it > fig. 153.
> Unscrew the tank cap counterclockwise.
> Place the cap from above on the open fuel filler
door > fig. 154.
> Insert the fuel pump nozzle all the way into the
fuel filler neck.
> Begin fueling. Once the fuel pump nozzle turns
off the first time, the fuel tank is full. Donot =>

Index

ExteriOmmirrorssecs os asco w 6 aeons vo ween 9 we 55
Folding settings............. eee eee eee 34
External voice operation................. 27
F
Factory default settings
Multi Media Interface................. 213
Fast route............ 0.0.0.0. . cee eee 182
Favorites... 0.2.0.0... cee eee eee eee 21
BIW@tOOth): < seca ss ceca s i yews se ees 2s 215
NaViGatiOnices ss sescsus so aves + ware eo nena 183
Telephone ..........0 00 cece eee eee 167
Federal Communications Commission (FCC) . 284
File formats (media drives).............. 207
Filling
Tank capacities.......... eee eee eee 287
For the sake of the environment
Disposing of engine oil................ 226
FOGUING's « « supe ¢ ¢ cause 5s same 7 2 eee a eae 218
LOAKS ice ie x erences = 6 caenene a 6 aueuioe we axons 6 eae 222
Forward gear
refer to Gears... . eee eee eee 97
Free text search
Media... .... eee ee eee eee 206
RadiO sys = ¢ seove + © sees ¢ crews ge pew Es 195
also refer to Intelligent search.......... 182
Freeze protection
Coolant... ... 2... eee eee eee 227
Windshield washer system............. 233
Frequency band..........-....--.000-5 193
also refer to Frequency band........... 193
Front center armrest..............02 0005 66
Front passenger’s seat adjustment
REAR « ieiam co nasi 3 onan + wR Ts HeEEE Be RO 65
Front wiper blades
Changing.......... 00. c eee ee eee eee 59
Cleaning... .. cece eee 59
Fuel... 2. eee eee eee 217
AGGItIVES: = ess = ven e = sees os owen ee xe 218
CUFrFeENE CONSUMPTION ¢ & sesso 6 3 ese ao eee 16
Fueldisplay....... 2... cece eee eee eee 12
GaSOliNGs « sees ss ween oe eee ce een es es 217
Reducing fuel consumption............ 102
Tank capacity...........0 ee eee eee eee 287
292
Fueling
Fuel filler door. ....... 0... cece eee eee 218
Fuel filler door emergency release....... 220
Functions on demand...............4.. 175
Functions that require a license.......... 75S
also refer to Functions on demand....... 175
Fuses
ASSIQNMENKS « & senses o 8 mnmors & & mamens @ & inerer 273
Replacing......... 0. cece eee eee eee 272
G
Garage door opener...........0..000 eee 48
Garment hooks ...... 2... 0c e eee eee eee 83
GaSOUME sscwee a 2 evarnes a a omawwes vx amos ow vase 2 217
Additives... 0.0.0... eee e cece eee eee 218
GasOliNe MIXtURE cnn « : seam ct same & 2 Hew 217
GAWR
refer to Gross Axle Weight Rating (GAWR) . 287
GOSTSics + nayss = = pees = yeu se eeUR GE ROUSE 97
Glossary of tire and loading terminology... 238
Glove compartment.............--000-05 83
Valet parking: « < ews + ¢ sees se news oe ees 48
Gross Axle Weight Rating (GAWR)........ 287
Gross Vehicle Weight Rating (GVWR)...... 287
GVWR
refer to Gross Vehicle Weight
Rating (GVWR) .............0000.0005 287
H
Handstreess «sss x i souness 6 0 annwine «a auaware x 163
Hands Free: Profiles «3 inisa ao inesow a vow & 163
Head-up display
Adjusting. ........... 0c cee eee eee eee 25
Adjusting the brightness................ 55
Operatings « : vem « x ewe 5 ¢ eee g 7 eee oe 25
Headlight range control................0. §1
H@AdLIQtS: ¢ = xcs ¢ < eees x = Resa cB eS ea 51
Gleanings « 2 svc so wes 2 wea ee res ees 256
Headlight range control................ 51
Washer system.........--00 eee eee eee 58
Washer system (filling washer fluid) .... . 233
Head restraints < seus « s ems s + sates =v egops se 67
Heated rear window...........0 eee eee 93
Heated steering wheel..............000.. 93
Heating...........0.. 00.0. cee 90