[M5Rick]

It's important not to have too old tyres especially on the rears being the drive wheels, BMW they say every six years as the rubber goes hard and with spirited driving can start to crack around the top of the sidewalls. The fronts can remain on longer and this one YO one arrived yesterday and happy to have fresh soft rubber on the back, it's replacing a worn one that's 7 years old. It doesn't have to be BMW rated ie no marking, can have NO AO or MO whatever.
You all know what happened to Paul Walker who was killed in US when the P-car he was a passenger in burst a too old tyre and hit an obstacle at speed.