94 -7.3 powerstroke, IDI, 250,000 mi. Has excessive oil consumption, 6qts in 40 miles of hard pulling with 30ft goose neck and 18,000# dozer in southern Ohio hills, started rather sudden,very very few leaks, just damp around rear main, still has plenty of power, no noticeable smoking, no blow by, thought it might be bad seal on turbo exhaust or intake, exhaust is dry with soot, intake is dry and very clean, no oil in water,, any help or similar experences?? Thanks

With that consumption, there must be evidence somewhere.

Due the fact that you do not have any blow by, it highly possible that its your valve stem seals. It is cheaper to just keep adding oil rather that have your engine torn down.