BMW has a good number, hell Toyota rav4, mini Coopers, mercs. You're behind the times if you think this is not true. Full synthetic oils and tighter tolerances in motors have gotten motors to this point. It's not 1953 where the motors consume oil and topping them up during fueling is a thing.
Can't find anything specific on the Mini Cooper, different dealers are saying anything from 4K miles to 12K miles. BMW dealers are saying anywhere between 5K and 15K. Mercedes looks to be every 10K miles.
First change is at 10k the next is at 30k, and that's a rav4. This isn't new, oils have gotten way better and motors are engineered at much higher tolerances.