I would repair it. All of those are known to go around 70k. Frankly I think you'll be over the hump and just have minor stuff to deal with for the next 70k.

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'08 X5 4.8i - 190k
'15 i3 - 95k - Blown AC compressor

'98 323is - 170k - Garaged
'94 325i - 208k - Sold