I brought my 540 back in March of 2022 with 29500 miles. Sitting at 29800~ miles right now.
I followed Mike Miller's maintenance thing on my E90 and plan on following that same maintenance plan for the G30(coolant flushes every 2 years, oil change 5k/6 months etc). I flushed the coolant on my E90 before i sold it. Super easy DIY. Not sure if anyone has done a coolant flush on their G30 yet.
Lifetime Maintenance Schedule:
http://www.dslreports.com/r0/downloa...e%20v03.13.pdf