The BMW 523i Touring represented the "ideal balance" ("goldene Mitte") among the six-cylinder models of the BMW 5 Series Touring. The engine characteristics of the BMW 523i were optimised for smooth delivery of high torque rather than maximum performance with a displacement of 2.5 litres and a peak output of 170 hp. The BMW 523i was therefore the ideal choice for drivers focused on comfort and who were also interested in the economy of their automobile.