Yes im heating the wvo, it has a copper heater wrapped around the metal spin-on filter and it has a heat exchange. Both which i burnt my hand on. and when the car was breaking down and i popped the hood one of the things i checked was if the fuel was gelling but the heaters were hot! i have the burn marks to prove it

But ive wasted all of the fuel and poured in half a tank of biodiesel and ive swapped the filters one last time. This is biodiesel was bought from bay area biofuel so its made properly. Ive also put in 2oz of PS diesel kleen the white bottle anti-gel just incase.

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Current:
05 E320 CDI
07 GL320 CDI
08 Sprinter
05 Dodge Cummins
01 Dodge Cummins

Previous
2004 E55 AMG
2002 C32 AMG (#2)
1995 E300
1978 300D
1987 300D
2002 C32 AMG(blown motor :[
1981 300SD
1983 300SD
1987 300SDL
2002 Jetta TDI
1996 S420
1995 S500
1993 190E 2.6
1992 190E 2.3
1985 190E 2.3 5-Speed

The tank strainer is what came to mind first.

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Jim