Valve cover gasket, oil filter housing gasket and oil cooler gasket are all suspect. Pick up a new valve cover and head off any other problems (CCV etc.). ECS sell the Bavauto OFH gasket made of DuPont rubber and they should have an OC gasket as well. They are quite cheap and it save a lot of headaches.
Drain & flush the coolant, refill with BMW brand AF/distilled water 50/50 mix. Check for leaks.

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2021 X5 xDrive40i
2015 X5 xDrive35i MSport
(Traded) 2013 X5 xDrive35i