I had my dropped off yesterday for the same ticking noise from the engine bay and it was kept over night. I got a called back from the SA this morning that she stated that the engine needed a lifter and the dealer will keep my car until this Thursday at their shop. Does not sound good to my ears when she said that. I will keep you posted once I get my car back, hopefully this coming Thursday.
This is longest time ever that she leaves home. I miss my ride

and luckily, I have a 2009 328i as a loaner.