2017-2024 Audi S5 4 Door General maintenance -> Filling the tank User Manual
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General maintenance -> Filling the tank for Your Audi S5 4 Door Fourth Generation (2017-2024)

document_0900452a81793dcc.book Seite 217 Mittwoch, 21. März 2007 5:42 17  
Fuel and filling the tank  
217  
Fuel and filling the tank  
Petrol  
Filling the tank  
Petrol grade  
Filling the tank  
The correct grade of petrol is listed inside the fuel tank  
flap.  
The vehicle is equipped with a catalytic converter and must only be  
run on unleaded petrol. Unleaded petrol must comply with the  
European EN 228 standard. The petrol grades have different octane  
ratings (RON). If, in exceptional circumstances, the correct octane  
rating is not available, please note the following:  
Fig. 207 Vehicle as  
seen from the rear  
right: Opening fuel  
tank flap  
Your engine normally requires Super Plus unleaded petrol (98 RON)  
according to ⇒ page 281, “Performance, weights and dimensions”.  
Premium unleaded fuel with 95 RON can also be used. This can,  
however, result in a slight loss of power under certain driving condi-  
tions. If premium unleaded petrol is not available, the engine can be  
run on regular unleaded petrol with 91 RON as an emergency  
measure. In this case only use moderate engine speeds and a light  
throttle. Avoid using full throttle. Fill up with premium or Super Plus  
petrol as soon as possible.  
Caution  
Fig. 208 Fuel tank flap  
with tank cap attached  
• Petrol complying with the EN 228 standard can contain small  
quantities of ethanol. However, “bioethanol fuels”, which are  
retailed under various different names such as E50 and E85, and  
which contain a large proportion of ethanol, must not be put into  
the vehicle, as this would damage the fuel system.  
The flap that covers the tank cap is unlocked and locked  
automatically by the central locking.  
• Even one tankful of leaded fuel would permanently impair the  
Unscrewing the tank cap  
efficiency of the catalytic converter.  
– Press the left side of the flap to open it ⇒ fig. 207 -arrow-.  
• High engine speed and full throttle can damage the engine when  
using petrol with an octane rating lower than the correct grade for  
the engine.  
– Unscrew the tank cap anti-clockwise.  
Controls  
Safety  
Driving tips  
General maintenance  
Self-help  
Technical data  
document_0900452a81793dcc.book Seite 218 Mittwoch, 21. März 2007 5:42 17  
218  
Fuel and filling the tank  
– Hook the cap onto the open flap ⇒ page 217, fig. 208.  
WARNING (continued)  
build up during filling, causing the fuel vapour to ignite. Danger  
of explosion. Always place the canister on the ground to fill it.  
Closing the tank cap  
– Screw on the tank cap clockwise until it cannot be turned  
further.  
− Insert the filler nozzle as far as possible into the spare fuel  
canister.  
– Press the left side of the flap to close it (you should hear  
it click into place).  
− If the spare fuel canister is made of metal, the filler nozzle  
must be in contact with the canister during filling. This helps  
prevent an electrostatic charge building up.  
When the automatic filler nozzle is operated correctly it will switch  
itself off as soon as the tank is “full”. Do not try to put in more fuel  
after the nozzle cuts out, as this will fill the expansion chamber in  
the fuel tank.  
− Make sure you never spill fuel in the vehicle or in the luggage  
compartment. Fuel vapour is explosive. Risk of fatal accident!  
Caution  
The correct fuel grade for your vehicle is given on a sticker on the  
inside of the tank flap. Further notes on fuel ⇒ page 217.  
• Remove any fuel spills from the paintwork immediately.  
• Never run the tank completely dry. If there is an irregular fuel  
supply, misfiring can occur. As a result unburnt fuel can enter the  
exhaust system and cause damage to the catalytic converter(s).  
The tank capacity of your vehicle is given in the Technical data  
section ⇒ page 279.  
WARNING  
For the sake of the environment  
Fuel is highly inflammable and can cause serious burns and other  
injuries.  
Do not try to put in more fuel after the automatic filler nozzle has  
switched off; this may cause the fuel to overflow if it becomes  
warm.  
• For safety reasons always switch off the auxiliary heating*  
before refuelling the vehicle.  
• For safety reasons we do not recommend carrying a spare fuel  
canister in the vehicle. The canister could become damaged in an  
accident and leak.  
• Observe all relevant statutory regulations on using, storing and  
transporting spare fuel canisters.  
• When filling your tank or a spare fuel canister with fuel, do not  
smoke and keep away from naked flames. Risk of explosion!  
• If, in exceptional circumstances, you have to carry a spare fuel  
canister, please observe the following warnings:  
− Never fill fuel into the spare fuel canister with the canister  
placed in or on top of the vehicle. An electrostatic charge could  
document_0900452a81793dcc.book Seite 219 Mittwoch, 21. März 2007 5:42 17  
Fuel and filling the tank  
219  
Releasing the tank flap manually  
The tank flap can be released manually if the central  
locking system should fail to operate.  
Fig. 209 Luggage  
compartment:  
Releasing the fuel tank  
flap manually  
The manual release mechanism is located behind the side  
trim on the right of the luggage compartment.  
– Open the right-hand side trim.  
– Release the ring from its holder and pull the ring  
⇒ fig. 209. You should now be able to open the tank flap  
in the usual way ⇒ page 217.  
Controls  
Safety  
Driving tips  
General maintenance  
Self-help  
Technical data  

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