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It doesn't really need an overhaul, just don't have a good history on the engine and labor is surprisingly cheap. Parts are another thing, not much cheaper but no shipping and the shops are used to working on these engines. Overall, I am just looking at the future costs if I have to do it back in the states compared to having something done here.It would depend on why it needs an overhaul. Is it only top end problems, or bottom end and cylinders/rings as well? I wouldn't think Japanese shop labour to be particularly cheap, but you are closer to new and used parts there, and it probably won't be the first one that they've done.
Is this something you're doing in-frame, or pulling the engine?
If they'll do the full rebuild top end and bottom end for $200 USD, including only genuine parts, I'd say go for it.
It sounds like it doesn't need a rebuild. 250km is nothing, my four cylinder Chevy Malibu gas engine had that when I bought it, and this is a much larger diesel.
Unless its blowing smoke and/or noisy with no power at 250K, it doesn't need a rebuild.
700K and with problems maybe. Generally, you don't fix things mechanically that aren't broken, as it can lead to more issues than it solves.
Perhaps ensure timing belt and tensioner have been replaced recently, all fluids, including coolant have been renewed, and water pump replaced for the sake of it. That's where I would stop in regular maintenance without present faults.