Audi A3 (Sedan) (2016) is 455 kg (1,003 lbs) lighter than BMW 5 Series (2018).
BMW 5 Series (2018) is 485 mm (19.09 inch) longer, 71 mm (2.80 inch) wider, 83 mm (3.27 inch) higher and has 144 liters (5.09 ft3) bigger cargo space than Audi A3 (Sedan) (2016).
