Pray tell us, was this the piston crown failing primarily, maybe due to poor fuel or pre-ignition, or are we now looking at a ringlands issue on a 2018 bike.
Can you get us some pics of the failed piston & scored bore please avfiat.
Like others, I am curious about the 2 year warranty issue - you need to talk to US HQ Customer Services direct if your dealer is 'ducking & diving' for any reason. Have you raised this with the Dealer Principal?
I've owned the bike since new with .3 miles on the odometer. I've had the bike for 18 months and killed off the warranty with 40K in 17. The motor has never seen anything but Chevron/Mobil/Shell 93 octane fuel and I've never heard it ping under acceleration. While I was on the phone with the BMW dealer I asked about the piston ring gap orientation As I expected he said he wasn't sure. I'm curious about this because the motor has always used oil about 1 qt per 6K. Proper ring orientation is huge on a motor that sits at a 45 degree angle in the frame and revs to 8.5K. Mine never saw that number I could feel it nosing over at 7K so I always shifted at 7K even with the Bren stage 2 map in it.
On the 26th I am going to the BMW dealer and taking a hard look at the pistons and cylinders and taking pictures.
I ended up with a 1 year extended warranty because when I went to buy a 2019 GT I couldn't because of the stop sale and at that point in time I had 35,800 on the clock so I bought the extended warranty from BMW to CMA while I waited for the stop sale to end.
More to come ............ Merry Christmas ALL