Two problems related to oil pump have been reported for the 2012 BMW 328. The most recently reported issues are listed below.
I was cruising on the highway when my idrive displayed �low oil pressure warning� and �drivetrain malfunction,� the engine weird noises before it shutdown and went into neutral while I was still around traffic. I barely made it a safe place to stop as I had to coast up a hill and then turn with whatever momentum I had. The steering wheel and brakes were extremely hard to move. I got my car towed and had a diagnostic test for codes shown in the attached screenshot. Had a certified mechanic take a look and was told by several other mechanics as well that oil starvation destroyed the engine as a result of oil pump failure. No sign or premature wear with a very generous 5,000 mile oil & filter change interval and been in the hands of BMW dealerships for all it's life.
I started my car and got a drivetrain malfunction warning. Drove it straight to the dealership where they told me my timing chain was stretched, which caused a vanos fault. They suggested replacing the timing chain and oil pump ($5500 repair). The car had 90k miles.