2007 Mercedes S-Class Owner's Manual - Page 491

Operation At the gas station Take off fuel filler cap and set it in direction of arrow 2 in the recess on the inside of fuel filler flap 4. 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! 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 i Leaving the engine running and the fuel cap open can cause the yellow engine malfunction indicator lamp ± to illuminate. For more information, see the "Practical hints" section ( page 547). Example illustration from S 550 G 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. 1 Coolant level 2 Brake fluid 3 Windshield washer and headlamp cleaning system i Opening the hood ( page 492). Replace fuel cap by turning it clockwise until it audibly engages. Close the fuel filler flap. 490