I repeated the same 1000 mile trip after 1000 miles with marvel mystery oil and a fresh oil change.
This time I burned one quart during the whole trip which seems much better. I can't say for sure it was the marvel mystery oil. I also discovered a gallon of rotella 10-30 on the shelf mixed with my supply of 15-40 when I did the oil change. I had forgotten that I bought a case of 10-30 last December when I thought I was headed to Niagra Falls for Christmas.

The rest of the case was missing so there is the distinct possibility that the first time I made this trip with the car I had accidentally put 10-30 weight oil in it. That might explain the excessive oil consumption as well.

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1985 300 TD 448K
1984 300 TD 278K

1983 240D euro 240k
1994 f-250 idi turbo 330K
1986 f-350 IDI
1987 F-350 IDI

1985 JD 1050 4wd
1965 IH 3660