Since you're doing this might as well do that.
07 335i 70k auto. Completely stock.
I am going to replace my water pump and thermostat. Also doing oil filter gasket, valve cover gasket and walnut blasting intake ports. I might do spark plugs depending on condition. I think they have 20k on them.
What else, any sensors, any upgrades, change to DCI, just remove the entire engine.
I figure I am saving just about 4 million, taking on the task myself.