Very interesting to see which options add to the residual value - interesting one on an M135i are that the adaptive suspension adds zero residual value, same for speaker upgrades and privacy glass. Sat Nav adds quite a chunk as does the cruise control and adaptive headlights packages.
Also metallic paint adds very little - probably due to white being so fashionable.
Haven't had chance to see if different cars gain residual value from different options.
Don't play with a girl's heart, it's easily broken and she only has one. Play with her boobs instead, they're bouncy and she has two of those.