I have a 2019 M3P and I have always run it with the tyre pressures set to 42 psi when cold as per the manual. However, the other day I noticed that the tyre pressure screen under Services is recommending 39 psi front and 40 psi rear. The message is in tiny print and may have been present for months before I noticed it. I have been very happy with the current settings of 42 psi all round and getting pretty even tyre wear after doing tyre rotation between the front and rear. Now I'm confused as to what pressures I should be using.