See, how can we say "oh, it's a great engine, you just have to sink $4-5k into it and you're good for 200k kms more?
Specially buying blind, without any indication of when the work was done, or whether the work was done? In the unlikely scenario you have full history and know exactly what was done and when (note, you still wouldn't know if an engine had overheated and been driven, for example...) it's totally a crapshoot. Spend $7 (or even $4.5k) and have the expectation that you might well have to sink an additional $3-4-5k on it 'soon' ? That doesn't make sense to me. In my view, when I see a M62, I mentally add $3-4-5 to the price and think "is it still worth it?" and I don't come out with a 'yes' very often.
I picture him waiting so long, he'll end up at that $4500 tradein value in 6 months time.