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Biodiesel will “cloud” (that is, form crystals) and become difficult to pump at higher temperatures than petroleum diesel. Biodiesels vary in their cloud point depending on the feedstock used to make them. During summer months and in warm climates, higher concentrations of biodiesel, B50 or B99.9 blends, are used without clouding issues. In the winter months, blend concentrations of B10 or B20 are required to avoid clouding.