If anyone has had similar experience with burning oil only on highway, please let me know what you did.
And a final thought, I MUCH prefer the 240 manual climate control over the automatic system in the 300s. I had never done a long trip in a 240 with working AC. Having the compressor cycle to maintain cabin temps is so much simpler than the monovalve setup. It does take some time to get used to feeling the engine load change all the time, but I like it.

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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