Diesel engines have a hard time operating in the cold, whether biodiesel is involved or not. Apparently, it was this boring old truth that messed with those school buses in Minnesota recently. Early reports stated that the small percentage of biodiesel (B2) mixed into the fuel was causing the buses to not run and, therefore, schools to close. The National Biodiesel Board has issued a statement that says that biodiesel had nothing to do the mess. Instead, an independent study confirmed that something in the petroleum diesel fuel caused the problems when temperatures dropped to 20 below zero. The Minnesota Department of Commerce said that early statements by the Bloomington School District that claimed biodiesel was the culprit were incorrect. Perhaps now the state's move to B20 by 2015 will continue without further temperature-related hiccups.
[Source: National Biodiesel Board]