So eight months later, I had this same oil change experience this evening.
There's been an oil change or two in between but I can't remember what I did, I think it was put two gallons in and forget about it since it never uses any.

It again took over two gallons to get it to just below halfway between min and max mark. Two gallons was barely even at the MIN mark on the plastic. My significant other who drives it daily reminded me that the PO had the oil pan replaced, wonder if it was a larger capacity pan from some other chassis?

Car has been and still seems perfectly happy with the oil level indicated halfway between min and max, even though it takes a lot more than everyone says it should to make that read as such. Anyone have the part number handy for the correct dipstick for a 94 E320? I'm still curious about this but less concerned since the thing seems happy over the long term.

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One more Radar Lover gone...
1982 VW Caddy diesel 406K 1.9L AAZ
1994 E320 195K