Another data point:

I've put 8k miles on homebrew BD until winter arrived, then switched to 85%WVO/15%RUG. Another 4k miles on WVO/RUG.

Keep the fuel filtered to 5 microns.

I use Canola WVO because it seems to have a lower gel point.

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Mark in MA
05 MB E320CDI 402k Granite Grey Metallic
05 MB E320CDI 267k Black
05 MB E320CDI 232k White
05 MB E320CDI 209k Tectite Grey
99 Dodge 2500 Cummins 5sp 148k
62 Jeep CJ-6 120k