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When using high bio blends in sub freezing temps gelling would be a real concern.
From my experience... Bio made from wvo is not as bad on gelling as bio made from animal fats. Blending in petroleum will certainly help with that situation. The company that you're getting your bio from should have testing results that have measured the actual cloud point temperature of their stuff. Certainly they would also be aware and concerned about cold weather reliability issues. Not good for business to have a bunch of cold customers with frozen fuel in their tanks.
Being a stationary tank you could look into insulating and heating your fuel tank to keep it above the gelling temp.
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Current fleet
2006 E320 CDI
1992 300D - 5speed manual swapped
former members
1984 300D "Blues Mobile"
1978 300CD "El Toro"
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