Hey folks, I've narrowed down on a 7-seater 2021 X7, with <18K miles and CPO'd.
I'd love your help on these questions:

1. On the BMW Certified inspection sheet, for "Wheel inspection", all four wheels are marked "5-OK". What does that mean?

2. Brake inspection: both the rear brakes are at 8mm, while the front ones are at 10mm. How much more life do you think they have before replacement?

3. Would you recommend buying additional warranties, to cushion the cost of expensive parts replacements?

4. I'm not doing any pre-purchase inspection, since it's a CPO. Anything else I should consider before buying this vehicle?

Thanks much in advance!