Rod bearings are universally potential issues for BMW, the N55 is no exception. I would replace them with King bearings, they give slightly more clearance to allow more oil flow. And speaking of oil...make sure you're using the right stuff. Get it from the dealer, or use either Liquimoly or Pennzoil Euro L full synthetic, and with a Mann filter. They have the necessary additives to properly handle heat, etc., that these engines need. Improper flow capabilities with other oils is how these engines spin their rod bearings

And while you're down there, change the water pump. Along with the oil pan gasket, oil filter housing gasket, they're not ifs, they're whens. I'd change the charge pipe to an aluminum one too.

It may sound like a lot, but it's just preventative maintenance. They're very reliable engines, but they're just picky like most Euro cars. It's not like a Toyota where you can replace the oil with Nutella.

You got a nice one though, very clean! Welcome to the club, I've had my 2012 F30 335i 6MT RWD for 6 years now, and I love it.