[Ravenseal]

My 2 cents on this:

A. 1,200 miles seems a tad excessive. I drive 300 miles a month. That means it'd take me 4 months to be able to drive the car the way it's intended?

B. It's 2022. If the break-in period was that godly and important for the engine and transmission, manufacturers would cover their bases using the ECU/DME to limit revs and top speed (Chevy did this with the C8). Otherwise, they'd be at fault while the vehicle is under warranty for 4 years. There's also no indication on the infotainment/dash when you turn on the car, or hell, a sticker. It's indicated as one phrase on a 40,000 word owner manual that gets reprinted for basically every BMW made.

C. The engines are "broken in" on the factory line, as other people on broader bimmerpost have pointed out. Modern manufacturing tolerances are also extremely precise, almost to the nanometer.

D. As long as all the temperatures are proper, it's likely safe to let the car rip a bit. Obviously, don't bounce it off the rev limiter repeatedly for 12 hours like you're at LeMans.

E. Doing an oil change between 1000-1200 miles is probably helpful for longevity.

F. If your car was sitting at the dealership for more than a day, someone already did a fat rip on the engine during a test drive.

G. Tires and brakes are another thing, they do need a proper break in.

H. Unless you're tracking the car, if BMW says something is a "lifetime fluid", it's probably fine to just let it be.

So all in all, the way I see it: it boils down to common sense. Don't beat the living shit out of your car for the first few hundred miles or so. Enjoy driving it.