Years ago, the new fuel type E10 was added to the normal super petrol E5. Uncertainty persists to this day: Who is actually allowed to fill up with what? Find out here.

For a long time, refuelling was very simple: there was regular petrol, super and diesel, and maybe a few more expensive special types. Then, in 2011, the new E10 grade came on the market – and with it confusion. What is the difference between the two types? Which can you fill up with without risk? And: is there any risk at all? t-online answers all the important questions.

What are E5 and E10?

For a long time, apart from diesel, there was only standard super petrol (no longer available in Germany). At 95, it has a higher octane content than the former regular petrol and was therefore always more expensive.

A bioethanol content of up to five percent is added to super. This is why it is known as E5 or Eurosuper. At the pumps, this fuel is also known as “RON 95” or “Super 95”. In 2011, on the initiative of politicians, Super with up to ten percent bioethanol was also introduced to the market – the then new E10 variety.

But not all engines can tolerate the high ethanol content. The concerns of car drivers were correspondingly great.

What will change for drivers of older cars?
Almost all petrol-driven vehicles can run on the new E10, and for most of them there is even an E10 approval from the manufacturer. You can find out which ones here. For the remaining cars – mostly older models – drivers should use the old E5. Otherwise there is a risk of engine damage due to misfuelling.

If in doubt, ask for confirmation of approval
Many drivers are still sceptical about Super E10, but so far no damage has been reported in the fuel system of a car approved for E10. Anyone who is unsure whether their car can tolerate E10 should follow the manufacturer’s instructions: The car must have been approved for it.

The manufacturers specify certain years of manufacture from which their cars can run on the fuel. If the car’s date of first registration is shortly before this year of manufacture, it is best to ask your dealer or the manufacturer for advice. If a car is designed for biofuel, you can also fill it up alternately with E10 or E5.

Fill up with Super Plus in an emergency
If you are completely unsure whether your engine will tolerate E10, you can fill up with Super Plus. With this fuel, which has a significantly higher octane content of 98 and a bioethanol content of five percent, drivers play it safe, even if reaching for Super Plus means higher costs.