Hello all
I will be installing a fed '85 617 engine into a fed '84 SD body. Before installing the replacement engine what changes - if any - should I make to the plumbing to avoid leaks that may arise from use of ULSD and/or WVO. I am not planning a WVO conversion but, who knows, if diesel goes to $5 bucks a gallon, I might decide to go that way. Since most work will be done easier with enging out of car, I want to do all I can before the instal.

Many thanks.

I would just plumb it stock. No mods are needed for ULSD, and the veg oil changes would not be any easier with the engine out.

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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