Buick Regal (2015) is 697 mm (27.44 inch) longer, 40 mm (1.57 inch) wider, 180 mm (7.09 inch) higher and has 67 liters (2.37 ft3) bigger cargo space than Mercedes SLK-Class (2017).
Mercedes SLK-Class (2017) is 220 kg (485 lbs) lighter than Buick Regal (2015).