I've been googling diesel run in, and generally encounter two opinions:
The first is treat it gently for the first 1000k, and do not exceed 2,000 rpm.
The second is drive it at 3/4 revs, maybe 2,500 to 3,000 revs depending on the engines operating range. And don't treat it gently, apply load and get the engine working as hard as you can within this range.
Who is right and why?
I should add the particular engine I am thinking of is my Toyota 3L from 1992, just re-built. Its a straight 4, no turbo. But I'm also interested in general about diesels including more modern ones.