Very interesting subject.

I typically will add BioDiesel when I can afford it and ND30 from time to time again as convenient.

No one mentioned, Something I have read in other threads, that some people even go so far as to add just a little SVO (Straight Vegetable Oil). This is also said to lube the fuel system and when diluted in Diesel should have no ill effect. This of course provides no cold weather protection.

Something to think about.

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85 300D 3 pedal. Current project.
83 300TD (need rear wiper assembly dead or alive)
84 300SD Daily driver
85 300TD almost 400k miles and driven daily.
98 E300D *sold
86 300SDL *sold and made flawless 10 hour journey to new home.