BMW M5 (F90)
Why 7.8: Bought by people who need one car to do everything and mean it — airport runs at 155 mph (250 km/h) averages. Docked only because half the appeal is the badge on the boot.
Layout
Natural habitat
Ride comfort
Sound
The S63 is muscular and bassy once the exhaust valves open, and there is a proper hard edge to it under load. But BMW pipes a large share of what reaches the cabin through the speakers, and with the turbos in the vee the real note stays flat to 7,200.
8-cylinder · turbocharged · 7,200 rpm redline · rated 6.3 / 10 for engine sound
Market value
Median asking price, good condition · €83k (2019) → €51k (2026), trending down · illustrative data
Child seats · ISOFIX
Both outer rear seats carry ISOFIX lower anchors plus top tether, rated to F3/R3 (i-Size compatible). Middle rear seat is belt-only.
Front passenger seat has no ISOFIX — BMW's own compatibility chart marks every lateral-fixture and i-Size category 'no' for that seat. A belt-fitted child seat is permitted there, seat racked back per the manual.
M5 CS swaps the middle rear seat for a second bucket seat but keeps the same outer ISOFIX points.
BMW M5 (F90) official 'Suitable Seats' compatibility document, BMW AG, Dec 2017
The long version
Every M5 generation follows the same script: buy it new for the badge and the numbers, watch it shed a third of its value within a few years, then hand it to a second owner who wanted the car all along and finally gets it at a discount. This one is already most of the way through that cycle, down from the low-90s to the mid-50s, which is exactly when Bargain Window kicks in. That second-owner crowd tends to actually use it, road trips, daily commutes, the odd track day, because they did not pay the badge tax the first owner did.