[QUOTE=Lug_Nut;3272114]Have you filled or topped up your fuel tank with any biodiesel blend greater than B-5? Many fuel stations throughout the country are peddling B-20. B-20 will operate in most domestic diesel engines, but no European engines including Mercedes, Porsche and VW. Use of these higher percentage blends may cause serious damage to these engines and is specifically outlined by Mercedes as a no warranty failure.
From Mecedes biodiesel Brochure5:
"Diesel fuel with up to B5 biodiesel content according to ULSD specification ASTM D975 meets Mercedes-Benz approved fuel standards and will not void coverage under the Mercedes-Benz New Vehicle Limited Warranty.
Diesel fuels between B6 and B20 or higher pose risks of engine and fuel system damage, and are not approved by Mercedes-Benz. Please refer to the following recommendations to help avoid engine and fuel system damage if you do not have the chance to refuel your vehicle continuously with ULSD, maximum B5:
• Fill up with ULSD (B5 or less) whenever possible, from a name brand fuel station.
• Regularly monitor your engine oil level if you have no choice but to use B20 fuel.
• Strictly follow the oil change intervals quoted in the instrument cluster and within your maintenance booklet, and use ONLY engine oils and filters approved by Mercedes-Benz for use in the vehicle.
• If you do not plan to drive your vehicle for several weeks, fill your vehicle’s fuel tank completely in advance with ULSD fuel.
• Limit engine idling time to five minutes or as mandated by local ordinance.
Fuel with biodiesel content greater than 20%, including B100, is not approved by Mercedes-Benz due to the risk of severe engine damage. Any damage caused by the use of such non-approved fuels will not be covered by the Mercedes-Benz New Vehicle Limited Warranty."
Monitor oil levels if using B6-B20: if level increase biodiesel contamination.
Change oil, fill tank with Dino diesel run to clear any bio diesel fom system.