My mech. said he checked mine at the 600 mile check up, and when I did my check up at 25,000 mile check up, it was very close to Spec. I will do my valves again soon , I am over 50,000 miles now, 84,000 Km. and it seems to run better every year, it is a 2011 300i downtown break in was WOT up a long hill , and 100 KM. top of hill closed throttle down hill, did that for 25 miles and went home and changed oil, hot,. then did variable speed for 1000 KM. I looked up tune up USA for the break in,.
it is moto tune usa