With the engine out, why not just replace the tensioner components, valley pan gasket, coolant hoses, any rubber bits/fuel lines, etc.? Much easier than when in the X.

Rule of thumb is that if it touches the engine and can wear out, replace it (motor mounts, for instance). Very conservative, but at that point you have a "new" motor in the vehicle and should not have any issues.

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Kirk
Las Vegas
2016 X5 40e Mineral White/Black Dakota Leather, ZLL, ZCW, ZDA, ZDB, ZPP, multi contour seats, rear side window shades, HK stereo
2011 E90M3, 6-speed manual