It has been good to have the X5 in the stable, but the time has come and I sold it yesterday. Have to move forward and I eyed a nice X3 (F25) with the N52 engine. Was toying with the idea to grab the N55 but I already have a biturbo and I decided to settle for the "lesser" inline 6. Has a much better fuel economy than the v8 and moves decent.
Thanks for all the input on this forum and GL with the upkeep.

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Stable: e92is, e46 M54B25, e83 N52, e53 N62 - sold, e39 M54B30 R.I.P.