I know the manual says at 18K (miles), but how long can one safely go under normal conditions before it really must be done? This looks like it would be easiest to let BMW do the job.
I'm about to change my oil again and want to fit a magnet in with the oil filter. Does anyone know what size is appropriate for a 2013? The options I've found so far are:
3/4" (19.05mm)
1" (19.05mm)
15/16" (23.8mm)
Thanks in advance!