This thread has been very helpful.
My E90 w/ 20,000 miles has had the ticking noise off and on for several months. I called the service department (Roadshow BMW Memphis) yesterday and scheduled an appointment with a very brief description of the problem. Of course, when I dropped my car off later that day, there was no noise. My SA, Vickie, quickly explained that they know what the problem is and are going to replace the cylinder head and lifters. I was in and out with a loaner car in ten minutes.
I will update when I get my car back later this week.
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