[blaster3500]

I dropped my 07 335i (CPO and extended maint) off at my dealership for a scheduled appointment on Monday night so they could start on the car Tuesday morning. I told them that the car had oil leaks (from what I can see oil pan or rear main and oil filter housing gasket, diff leak, an occasional miss at idle, rough start up, and wastegate rattle. In the past 3 days all that they can tell me is my oil filter housing gasket is leaking and they are not sure what is causing my problems. Today I call but the service adviser was busy, but the lady told me that they are diagnosing my car. Is this common practice? I work on cars and understand that it takes time but after 3 days I have no estimated time when I will get my car back or what is going to be fixed.