Two problems related to gas recirculation valve (egr valve) have been reported for the 2012 BMW 528. The most recently reported issues are listed below.
Vehicle messaged me while driving that oil pressure was low. Stopped, and restarted with no issues. Investigated online and discovered that the engine had a well known problem with the timing guides becoming brittle and disintegrating sending parts into the sprockets and the oil sensors. Also chain makes a whining noise if affected. Had the vehicle towed to dealership where the timing chain guides were diagnosed as being the problem. Out of extended warranty (7yr/70k) by one year and 5k miles. BMW knows of the problem and refuses to voluntarily recall affected vehicles. Could result in catastrophic engine failure at highway speeds and result in a serious accident.
I was stopped at a red light making a left hand turn when the vehicle powered off with a warning of a drive train malfunction. The vehicle did not restart and I was stranded in 10 degree temperature for 2 hours waiting for a tow. I had no warning light prior and am now told I need an entire new engine.