2021-2026 Seat Leon 4 Door Practical tips -> Fuel types User Manual
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Practical tips -> Fuel types for Your Seat Leon 4 Door Fourth Generation (2021-2026)

Practical tips  
2
Diesel according to EN590 standard. The  
number indicates the maximum percent-  
age of Biodiesel in the fuel. “B7” means a  
maximum of 7% Biodiesel.  
Super unleaded petrol 95 octane petrol or  
normal 91 octane petrol at least  
Fuel types  
Identification of fuels1)  
We recommend refuelling with super 95 oc-  
tane petrol (91 AKI). If not available, normal 91  
octane petrol (87 AKI) (with a slight power  
loss) may be used.  
3
4
Synthetic diesel according to EN15940  
standard.  
Natural gas: “CNG” means Compressed  
Natural Gas.  
Super unleaded petrol, 95 octanes at  
least  
You should use super 95 octane petrol (91  
AKI) at least.  
Type of petrol  
3 Valid for: vehicles with petrol engines  
If super is not available, if necessary, use nor-  
mal 91 octane petrol (87 AKI). In this case only  
use moderate engine speeds and a light  
throttle. Refuel with super as soon as possi-  
ble.  
The correct grade of petrol is listed inside the  
fuel tank flap.  
The vehicle is equipped with a catalytic con-  
verter and must only be run on unleaded  
petrol. The petrol must comply with the  
standard EN 228 and be sulphur-free. Fuels  
with a 10% ethanol ratio can be refuelled  
(E10)2). The types of petrol are differentiated  
by using the octane numbers (RON) or via  
the anti-knock index (AKI).  
Fig. 223 Identification of fuels according to  
European Union (EU) Directive 2014/94/  
Unleaded super plus 98 octane petrol or  
super 95 octane petrol at least  
Fuels are identified by different symbols on  
the pump and on your vehicle's tank flap. The  
identification serves to prevent confusion  
when choosing the fuel.  
We recommend refuelling with super plus 98  
octane petrol (93 AKI). If not available: super  
95 octane petrol (91 AKI) (with a slight power  
loss).  
1
Petrol with ethanol (“E” stands for Etha-  
nol). The number indicates the percent-  
age of ethanol in the petrol. “E5” means,  
for example, an ethanol ratio of 5% max.  
If super is not available, if necessary, use nor-  
mal 91 octane petrol (87 AKI). In this case only  
use moderate engine speeds and a light  
1)  
Depending on country  
2)  
Follow the regulations of the country you are  
driving in.  
320  
Checking and refilling levels  
throttle. Refuel with super as soon as possi-  
ble.  
Diesel  
Note  
3 Valid for: vehicles with diesel engines  
Fuel with an octane rating higher than the  
one required by the engine can be used.  
CAUTION  
Please note the information on the inside of  
the fuel tank flap.  
In countries in which there is no sulphur-  
Fuels high percentage of ethanol, e.g.  
E30 - E100 button must not be used. The  
fuel system would be damaged. Exception:  
vehicles with Totalflex engine page 321,  
›››  
Ethanol fuel.  
free fuel, it is also allowed to use low sul-  
phur content fuel.  
The diesel can thicken at very low tempera-  
tures, thus affecting the start or operation of  
the engine. Ask your service station attendant  
if their diesel is suitable for winter use.  
Ethanol fuel  
A single refuelling with leaded fuel or  
other metal additives entails a permanent  
deterioration of the effectiveness of the  
catalytic converter.  
Water in the fuel filter2)  
3 Valid for: vehicles with Totalflex engines  
If your vehicle has a diesel engine and is  
equipped with a fuel filter with a water sep-  
arator, the instrument panel may display the  
You can recognise vehicles with Totalflex en-  
gines1) by label on the fuel tank lid with the  
marking “Petrol/ethanol”.  
Only use fuel additives that have been  
approved by SEAT. The products that con-  
tain substances to increase the octane rat-  
ing or decrease knocking may contain met-  
al additives that damage the engine and  
catalytic converter. This type of products  
must not be used.  
following warning:  
Water in the fuel  
Vehicles with Totalflex engine can run with  
unleaded petrol (95 octane / 91 AKI) accord-  
ing to ANP No. 57 and with fuels with any high  
percentage of ethanol. The vehicle is refuel-  
led in the same way as petrol refuelling.  
filter. If this is the case, take the vehicle to  
a specialised workshop so that they can  
drain the fuel filter.  
Do not use fuels shown in the pump as  
CAUTION  
Also consider that page 320, Type of pet-  
›››  
containing metals. LRP (lead replacement  
petrol) fuels contain high concentrations of  
metal additives. Risk of engine damage!  
Never use of FAME (biodiesel that does  
rol  
not meet the EN590 standard), petrol,  
heating oil, other fuels or thinning agents  
as they can cause severely damage the  
fuel system and the engine.  
Note  
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.  
SEAT recommends filling the tank exclu-  
sively with petrol every 10,000 km to de-  
crease impurities that using E100 ethanol  
fuel might have left in the engine.  
If the wrong fuel has been filled, do not  
»
start the engine under any circumstances.  
1)  
This motor is only available in some markets.  
Depending upon country.  
2)  
321  

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