2005 Mercedes S-Class Owner's Manual - Page 286

Operation At the gas station 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. Check regularly and before a long trip 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 the fuel cap by turning it to the right. You will hear when the fuel cap is tightened. Close the fuel filler flap. i Leaving the engine running and the fuel cap open can cause the yellow engine malfunction indicator lamp ? (USA only), ± (Canada only) to illuminate. For more information, see the "Practical hints" section ( page 341). 1 Windshield washer and headlamp cleaning system* 2 Coolant level 3 Brake fluid i Opening the hood, see ( page 286). 284