The only place I ever saw Delvac-1 was at a TA truck stop in PA. Wal-mart in East Meadow used to sell the Mobil 5w-40 5-quart bottles, which I have not seen in a year or so.

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1986 190D, 2.5L, 5-speed swap, 180,000 Miles (60K by me).
Jeep CJ-7 with Cummins 4BT/NV4500/AtlastII 4.3.
Grand Wagoneer 4BT project in progress!