Audi A5/S5   General maintenance   Checking and topping up fluids  Fuel
Please note the information on the inside of the fuel tank flap.
The use of sulphur-free diesel to EN 590 (in Germany: EN 590 or DIN 51628) is recommended. If that type of fuel is unavailable, diesel to EN 590 can be used. It must have a cetane number (CN) of at least 51. The cetane number indicates the ignition quality of the diesel fuel.
Winter-grade diesel
Diesel fuel can thicken in winter. For this reason petrol stations in some countries also offer winter diesel.
Caution!
  • The vehicle is not designed for the use of biodiesel (FAME fuel). The fuel system would be damaged if you used biodiesel.
  • Do not mix fuel additives ("thinners", petrol or similar additives) with the diesel fuel.

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