I also use Motul Fully Synthetic from March to December. Usually changed at 3K miles intervals if I get 2 events done. around 5K with one event.
Also running distilled water with 2 bottles of water wetter.
Oil reached in 290s last time without limp mode
During winter antifreeze goes back in and I use BMW's 5-30. Since I do not drive much I do not change it until March regardless of mileage.