Your car has “valvetronic” variable valve lift, you need someone used to these engines to remove the cam covers( including the two electric motors for the valves) the top timing covers- check the timing withe the vanos camshaft hubs locked not still in operating mode. Check all the intermediate levers on the inlet cams are still in place ( they can jump out with timing/ oil pressure issues).
DO NOT CRANK IT OVER there’s a casting around the outer run of the cam chain in the lower case, if there’s any slack at all it can kink the chain and wreck the crank case/ crank hub.
If you’ve not drained the oil yet I’d do this first and either see your self or have it tested in case it’s run the bearings.
I’m a master tech at Bm and these need someone who knows what they’re doing
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