I need a bigger family car and was looking at used diesel E Class' (220 or 250) or 5 Series (520d) I can afford something a few years old with around 40-50k miles on the clock. I'd like to go for the more reliable of the two, does anyone have any advice?... Should I look at an A6 too?
Ps. needs to be wide across the back seats, fitting 2 narrow car seats and a slim passenger (MiL)
Budget about 16k