In the past week my 240D has developed a very bad sounding engine. I am trying to determine if it is a nailing injector or something worse. I can hear it very clearly inside the car while driving but the car sounds mostly normal at idle. The car has a known 136k miles and a good maintenance history but it did sit unused for about 5 years from 2001-2006. New to me injectors from a known good source. Oil analysis shows slightly elevated iron but very elevated copper.

Here is a video from under the hood.

March 22 part 3 - YouTube

And under the car.

March 22 part 4 - YouTube


Any thoughts?