First off, a 60k+ mile 4.8is would fetch 30k tops. Maybe if it is in exceptional condition all around.

Knock off the depreciation due to the cosmetic and obvious mechanical issues (even a replacement engine won't bring it to top value) and you are talking about a vehicle worth maybe $25k when it is repaired. I suppose you could find a sucker willing to pay more if they don't know about the engine.

So given a final value of $25k, it is reasonable to say that parts and labor for a replacement engine is around $10k, maybe more (your engine above without oil pan is less than ideal. Why is the oil pan missing????) Plus the headache of the whole ordeal and trying to make a profit...

Your X5 is worth $10k wholesale. An honest opinion from someone that does this sort of thing. It's a standing offer...

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12 X5 M - 06 X5 4.8iS - 03 X5 4.4i - 03 M5 - 02 X5 4.6is - 99 M3 Dinan S3 - 98 M3 - 92 850i-6 - 92 850i - 91 325ix - 89 M3 2.5 - and a few parts cars