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FAME biodiesel degrades quickly, absorbs moisture, and should not be stored for extended periods — problems Nigel Calder attributes to its chemical structure as a fatty acid methyl ester.0:26 HVO (hydrogenated vegetable oil), by contrast, behaves like mineral diesel and can be stored long-term without the same degradation risks.0:56 Calder distinguishes the two because "green diesel" may refer to either type, and the correct layup and storage treatment depends entirely on which one is in the tank.0:24 HVO is not yet widely available, but Volvo Penta now builds engines rated for 100% HVO, and supply is expanding in Germany.1:07 Calder's practical guidance: if the green diesel in question is HVO, treat it the same as conventional diesel for storage; if it is FAME, apply the same short-storage caution as with traditional biodiesel blends.1:21 Jan Attenstedt notes that fuel-related problems are a leading cause of marine engine failure and points to a boat diesel engine maintenance course for deeper coverage.1:36

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