About oil change times.
This vid is not lying about having your oil (and the oil filter of course) changed at around the 5000 mile mark on your M5, manufacturers recommendations of 10k to 15k miles are just too many miles on these and can cause a malfunction if oil is too old, even f/s oil properties start wearing out before long. For $ change to £ !
..and get your service book stamped for a trouble free service history, these cars weigh nearly 2 tons so
you might decide not to do it yourself and the safest way is on a dealer's ramp. I time it with the MOT and any other things I may want done like brake fluid change, spark plugs etc at the same time to save you coming back again.