I'm with JCL here. It's a classic Occam's chainsaw type situation: when other possibilities have been removed, don a goalie mask and get a chainsaw to solve your problems. Something like that.

In other words: dude, it ain't the oil. You did something during the oil change process or some random part failed precisely at the same time as you doing an oil change (in which case you are a very unlucky guy).

Start closely checking all hoses, electrical connections (clean, dry, connected), etc., etc.

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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