http://www.cleanmpg.com/forums/showthread.php?t=14973
Quote:
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Currently, clean diesel cars from Mercedes and Volkswagen sold in North America only allow blends up to B5 under warranty. The reason is because manufacturers are concerned that high levels of biodiesel may dilute the engine oil when used in engines with certain emissions control systems. In those systems, fuel is injected after combustion, with the intention of having the fuel vaporize but not burn, then exit through the exhaust valves and travel down the exhaust stream to the particulate filter where it is used to incinerate the collected soot. Since biodiesel has a slightly higher boiling point than petroleum diesel, it will not vaporize as readily and may make its way into the crankcase and dilute the motor oil. Therefore, B5 was determined to be the limit for acceptable oil dilution levels in many new cars. Any biodiesel must be made to ASTM D6751 standards in order to be acceptable.
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Is the pump clearly marked as biodiesel?