[M5 Hayden]

Last year my 2012 BMW M5 suffered from a breakdown from flywheel being loose which is cutting the crankshaft positioning sensor, making the car undrivable, didn’t want to fix it as it would be too expensive, since that the car was sitting in my driveway and left unstarted for about 6 months.

I’m looking to bring it back to life in the next month. Other than changing oil what maintenance should I do before starting my M5 that’s been left unstarted for quite a long time?

Thanks