Air suspension strut leaks
Every US 7 Series of this generation rides on air springs, and BMW extended the warranty on the front and rear air strut assemblies of G11 and G12 cars, the M760i included, to 8 years or 80,000 miles from the date the car was first sold (SIB 01 05 22; it has ended on most 2017 and 2018 cars); other air suspension parts are not covered. Two 7 Series owners' NHTSA complaints describe leaking struts, one with a failed compressor. Out of coverage, a remanufactured front strut costs about $860 to $1,060 before labor.
How to check
Check that the car sits level after standing overnight, watch for suspension warnings, and ask a BMW dealer whether the VIN still has the extended strut coverage, which runs 8 years from first sale up to 80,000 miles.
