Which used BMW 5 Series estate should I buy?
Unless you need a petrol engine because you only do short commutes, you're better off choosing the refined 520d for its blend of usable power and fine fuel economy. There are loads of examples on the used market, too.
SE gets you all the equipment you need, including climate control, cruise control, sat-nav, front and rear parking sensors and bright LED headlights. M Sport adds plenty of sporty styling touches, but its sports suspension is too hard. If you must have an M Sport, though, make sure you find a car fitted with adaptive dampers, because Comfort mode on these transforms the ride.
Our favourite 5 Series Touring: 520d SE