2011 Mercedes R-Class Owner's Manual - Page 355

Service products and capacities ! Do not fill the tank with gasoline. Do not blend diesel fuel with gasoline or kerosene. Otherwise, the fuel system and the engine will be damaged. Damage resulting from the use of gasoline or kerosene is not covered by the Mercedes-Benz Limited Warranty. To prevent malfunctions, diesel fuel with improved flow characteristics is available in the winter months. Check with your fuel retailer. Information on the fuel grade can usually be found on the gas pump. If the information cannot be found on the gas pump, ask service station personnel. For further information, contact an authorized Mercedes-Benz Center or visit http://www.mbusa.com (USA only). Diesel engines - fuels with biodiesel (FAME [fatty acid methyl ester]) Mercedes-Benz USA approves the use of B5 (ULSD with a maximum of up to 5 percent by volume biodiesel) for all diesel engines with common rail direct injection (CDI) and BlueTEC. Pure biodiesel and diesel fuels containing a higher percentage of biodiesel, e.g. B20, may cause damage to the fuel system or engine and are therefore not approved. Please ask the service station personnel for further information. The label on the gas pump must indicate clearly that the B5 biodiesel blend meets the ULSD standard. If the label is not clear, do not refuel the vehicle. The Mercedes-Benz Limited Warranty does not cover damages caused by the use of fuels which do meet Mercedes-Benz approved fuel standards. have the additives which prevent the build up of carbon deposits. If you use fuels without these additives for a longer period of time, there may be a build up of carbon deposits, especially on the inlet valves and in the combustion chamber. This could lead to engine running problems, e.g.: Rwarm-up Runstable 353 ! Do not refuel with low-grade fuel and do not use fuel additives that are not tested and approved for Mercedes-Benz vehicles. Serious damage or malfunctions can result that are not covered: Rby the Mercedes-Benz Limited Warranty Rby an existing Limited Warranty Rby an extended Limited Warranty AdBlue® Important safety notes i For BlueTEC vehicles only. AdBlue® is a non-flammable, non-toxic, colorless, odorless and water-soluble fluid. Additives in gasoline One of the major problems in engine design is the creation of carbon deposits during the process of burning fuel. Mercedes-Benz recommends that you use fuel brands that Z Technical data hesitation idle Rknocking/pinging Rmisfire Rpower loss In areas where carbon deposits may be encountered due to lack of availability of gasoline which contains these additives, Mercedes-Benz recommends the use of additives approved for use in Mercedes-Benz vehicles. Contact an authorized Mercedes-Benz Center or visit http://www.mbusa.com (USA only) for a list of approved products. Observe the instructions for use on the product label. Do not mix other fuel additives with fuel. This causes unnecessary costs and could damage the engine.