I don't think it will work due to the oil filter housings. I believe the 616 from the W115 used a diffrent style filter.

If the original 616 is working (you said you plan to use it in another project) why would you swap another engine for it?

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine