2005 Mercedes E-Class Owner's Manual - Page 302

Operation At the gas station Warning! G i Leaving the engine running and the fuel cap open can cause the yellow fuel tank reserve warning lamp to flash and the ? malfunction indicator lamp (USA only) or the ± malfunction indicator lamp (Canada only) to illuminate. See also "Practical hints" section ( page 362). i Diesel engine: Only use commercially available vehicular diesel fuels No. 2 or No. 1 (ASTM D975 No. 2-D or No. 1-D). Information on diesel quality can normally be found on the fuel pump. For more information on diesel fuels, refer to the Factory Approved Service Products pamphlet. Overfilling of the fuel tank may create pressure in the system which could cause a gas or diesel fuel discharge. This could cause the gasoline or diesel fuel to spray back out when removing the fuel pump nozzle, which could cause personal injury. Replace the fuel cap by turning it to the right. You will hear when the fuel cap is tightened. Close the fuel filler flap. i Gasoline engine: Only use premium unleaded gasoline with a minimum Posted Octane Rating of 91 (average of 96 RON/86 MON). Information on gasoline quality can normally be found on the fuel pump. For more information on gasoline, see the Factory Approved Service Products pamphlet. i Diesel engine: If you have driven the vehicle until the tank is empty, the fuel system needs to be bled ( page 432). 300