2025-2026 Audi A5 4 Door Checking and Filling -> Fuel User Manual
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Checking and Filling -> Fuel for Your Audi A5 4 Door Third Generation (2025-2026)

Checking and Filling  
Checking and Filling  
Fuel  
Note  
Filling the tank just one time with leaded  
fuel or other metallic additives will cause  
permanent deterioration to the catalytic  
converter function.  
Types of gasoline  
The correct gasoline grade is stated on the inside  
of the fuel filler door.  
When gasoline with an octane rating that is  
too low is used, high speeds or heavy engine  
load can lead to engine damage.  
The vehicle is equipped with a catalytic converter  
and must only be driven with unleaded gasoline.  
Tips  
Audi recommends using TOP TIER Detergent Gas-  
oline. For additional information on TOP TIER De-  
The vehicle may be filled with fuel that has a  
higher octane rating than what is required by  
the engine.  
The individual gasoline grades are differentiated  
by octane ratings. This value is given with  
(R+M)/2 equating to AKI or in RON.  
Gasoline mixture  
Gasoline with alcohol (ethanol)  
The headings below match the sticker in the fuel  
filler door (examples):  
You can fuel your vehicle with unleaded gasoline  
that has an ethanol content of up to 15%, for ex-  
ample “E15”.  
UNLEADED FUEL ONLY MIN. (R+M)/2 87  
Regular / MIN. RON 91 Regular  
Gasoline adapted to the season  
Use regular gasoline with minimum 87 AKI /  
91 RON ð  
.
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.  
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  
Note  
Using premium gasoline with minimum 91 AKI /  
95 RON is recommended.  
Do not use gasoline that does not meet the  
specifications.  
Ethanol fuels with a high ethanol percent-  
age, such as E30 – E100, must not be used.  
The fuel system will be damaged!  
Methanol fuels with a high methanol per-  
centage, such as M5 – M100, must not be  
used. The fuel system and the engine will be  
damaged!  
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 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.  
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.  
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  
234  
Checking and Filling  
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.  
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  
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.  
Fig. 156 Right rear side of the vehicle: opening the fuel  
filler door  
Audi recommends using TOP TIER Detergent Gas-  
oline. For additional information on TOP TIER De-  
If you use incorrect fuels over a long period of  
time, the maximum engine performance may be  
impaired by combustion residue.  
Fig. 157 Fuel filler door with attached fuel cap  
Note  
The fuel filler door is unlocked or locked by the  
central locking system.  
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.  
Unlock the vehicle if necessary.  
Press on the left side of the fuel filler door to  
open it ðfig. 156.  
Unscrew the tank cap counterclockwise.  
Place the cap from above on the open fuel filler  
door ðfig. 157.  
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. Do not  
continue fueling, or else the expansion space in  
the tank will be filled with fuel.  
After the fuel pump has turned off, wait five  
seconds before removing the nozzle to allow  
the rest of the fuel to finish dripping into the  
fuel tank.  
Refueling  
Messages  
The following messages may appear, depending  
on the vehicle equipment:  
Messages  
If the indicator light appears with a corre-  
sponding message, refuel the vehicle.  
Tank system: malfunction! Please contact  
Service  
235  

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