Biodiesel tends to degrade faster than petro-diesel. In one sense this is a good thing: a biodiesel spill will biodegrade quickly and not cause as many environmental problems as a petro-diesel spill.
On the other hand, biodiesel tends to be more vulnerable to oxidation when exposed to harsh environments than fossil diesel. If biodiesel is to be stored for longer than six months, a stability additive should be used, especially in warm, humid climates.
For more information, see Transportation and Storage of Biodiesel.
