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E53 X5 has aged quite well, IMO. The drive is still solid 15yrs later. The M54 engine is reliable too.
Transmission issue is rather case isolated. We can't tell when one will failed. If you're getting one in 100-110 k miles range, at least do a tranny fluid drain and refill a couple times to get as much new fluid in there as possible.
With your experience in working on bimmers in this era and the wife's support, I would say: go for it.
Good luck.
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00 E39 DINAN S1 //M5 (82k miles)
06 E53 DINAN 4.8iS, born 2/18/2006 (126k miles) http://www.xoutpost.com/bmw-sav-foru...s-my-dslr.html
90 Straman Z32 TwinTurbo Convertible, (1 of 44 ever made) 5 speed, 444rwhp/451rwtq
01 360 Novitec Spider F1 (26k miles)
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