Originally Posted by DLSTR

Nice review of the M240i. I still have my 2014 M235i. Almost 90000km's. Full service done this week. Still no issues. The intake valves are spotless. The N55 is not known at all for intake valve coking/carbonization.

I will ask my superb mech and dealer if they have any insight into the new motor in the M240i.

My paint and interior quality is excellent and holding up quite well. The dealer changed my valve cover and the head and cam/valvetrain was spotless.
I use 5w-30 Castrol from the dealer per the LL04 BMW spec. I change it between 12 and 15000km's. Clearly the oil has no issues nor does the engine in terms of dirt/residue. The mech as very pleased to see how clean it all was. I shall post pics soon of the motor for you to see.

Good luck if you get a BWM.