The BMW 5 Series F10 (sedan) and F11 (Touring/wagon) marks a return to classicism after the controversial design era of Chris Bangle (E60). Based on a shortened 7 Series (F01) platform, it offers imperial comfort, top-notch sound insulation, and impeccable finish quality. The facelift (LCI) occurred in July 2013, bringing minor aesthetic touches, an iDrive system update, and new engines. While its road qualities are undeniable, its mechanical reliability is very heterogeneous, particularly for petrol engines where the choice of engine code is absolutely crucial to avoid astronomical bills.
The BMW 5 Series F10/F11 is an exceptional touring car, but it's a vehicle where 'blind' buying is forbidden. If you're looking for a petrol engine in Europe, the 535i (N55) is the best choice, offering true BMW character with decent reliability provided preventive maintenance is performed. The 4-cylinder petrol engines (N20) should be avoided before 2015 due to the timing chain, and the European naturally aspirated 6-cylinders (N53) are potential money pits (injectors). Flee the 550i (N63) Phase 1 like the plague. Paradoxically, for maximum reliability on this generation in Europe, a post-2014 diesel model (B47) or a well-maintained 6-cylinder diesel (N57) often proves less risky than the entry/mid-range petrol models.