E92 M3 - What to check on iDrive when purchasing

[ratty6464]

There's been a lot of talk on the running costs and ownership experiences for e92s, with mention of checking the idrive when buying second hand.

I've not used idrive before, so what exactly can you check when using it, and how would the info affect doing a deal on an AUC?

i.e. if you ring a dealer to enquire about an AUC, what can you ask them to check on the idrive to get an idea of the conditioned based service requirements?
Can this info be factored in to budgeting for the next couple of years running costs? and what are the service intervals for clutch, gearbox, diff, brakes etc?