2011 Mercedes R-Class Owner's Manual - Page 354

352 Service products and capacities Fuel Important safety notes G Warning! Fuel is highly flammable. Fire, naked flames and smoking are therefore prohibited when handling fuels. Switch off the engine and the auxiliary heating before refueling. depress the accelerator pedal further than 2/3 of the pedal travel. Fuel requirements Gasoline engines Use only premium-grade unleaded gasoline. The octane number should be at least 91. Details can be found on the gas pump. The octane number is the average value of the Research Octane Number (RON) and Motor Octane Number (MON): (RON + MON) / 2, also known as knock resistance. Reformulated Gasoline (RFG) and/or unleaded gasoline with additives can be used if the concentration of the additives in the fuel does not exceed 10%, e.g.: REthanol RTAME RETBE RIPA RTBA G Warning! Technical data Gasoline and diesel fuels are highly flammable and poisonous. They burn violently and can cause serious injury. Never allow sparks, flames or smoking materials near gasoline or diesel fuel! Turn off the engine before refueling. Whenever you are around gasoline or diesel fuel, avoid inhaling fumes and any skin or clothing contact. Extinguish all smoking materials. Direct skin contact with fuels and the inhalation of fuel vapors are damaging your health. Premium-grade unleaded gasoline ! To ensure the longevity and full performance of the engine, only premiumgrade unleaded gasoline must be used. If premium-grade unleaded gasoline is unavailable and regular gasoline is used, observe the following precautions: Ronly fill the fuel tank to half full with regular unleaded gasoline and add the rest as soon as possible with premiumgrade unleaded gasoline. Rdo not drive at the maximum speed. Ravoid sudden acceleration. Rwhen the vehicle is carrying a light cargo, e.g. two passengers without luggage, do not allow the engine to rev above 3000 rpm. Rwhen the vehicle is fully loaded or being operated in mountainous terrain, do not For MTBE, the concentration should not exceed 15%. The concentration of methanol in gasoline including other additives must not exceed 3%. Using mixtures of methanol and ethanol is not permitted. Gasohol, a mixture of 10% ethanol and 90% unleaded gasoline can be used. All of these mix fuels must fulfill the fuel requirements, e.g.: Rknock resistance point Rvapor pressure Rboiling Diesel engines - important safety information ! Only use commercially available ULTRALOW SULFUR DIESEL FUEL (ULSD, 15 ppm MAXIMUM SULFUR) that meets the ASTM D975 standard. Failure to use ULTRA-LOW SULFUR DIESEL FUEL (ULSD) can severely damage the vehicle's exhaust gas aftertreatment system.