2004 Mercedes C-Class Owner's Manual - Page 250

Operation At the gas station Open fuel filler flap by pushing at the point indicated by the arrow. The fuel filler flap springs open. Turn fuel cap to the left and hold on to it until possible pressure is released. Take off cap and set it in the recess on fuel filler flap. To prevent fuel vapors from escaping into open air, fully insert filler nozzle unit. Only fill your tank until the filler nozzle unit cuts out - do not top up or overfill. Warning! G i 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. More information on gasoline can be found in the Factory Approved Service Products pamphlet. Flexible Fuel Vehicles are identified by a label reading Premium gasoline or E85 only! on fuel filler flap. For more information, see "Flexible Fuel Vehicles" ( page 354). Overfilling of the fuel tank may create pressure in the system which could cause a gas discharge. This could cause the gas to spray back out when removing the fuel pump nozzle, which could cause personal injury. Replace fuel cap by turning it to the right. You will hear when fuel cap is tightened. Close fuel filler flap. i Leaving the engine running and the fuel cap open can cause the ? malfunction indicator lamp to illuminate. For more information, see "Practical hints" ( page 276). 250