Finally got everything back together after a full spline lube, went for a short ride to warm things up and op check. Time to change the fluids. No issues until I came to the oil filter.. My BMW filter socket did not fit.. Nor did any of the other three I have. BLEEP.. Used a double fold of some denim to finally get the filter loose. Blue filter, (dimples instead of flats) turns out it was an AC Delco filter?? Last service was at a BMW dealer as well. The Mahle filter I replaced it with uses my standard oil filter socket, the one I have used on many BMW motorcycles.