Specification levels for the 508 include Access, SR, Active, Allure and GT models. Engines are 1.6 and 2.0 HDi diesel with power outputs of 112, 140, 163 and 200bhp.

Lowest emitting are the HDi 112 diesel engine, with either a five-speed manual gearbox or e-HDi Stop & Start System with a six-speed electronically controlled manual gearbox (EGC). The fitment of the e-HDi Stop & Start System technology on the 508 enables customers to reduce fuel consumption (up to 15% in urban driving) while the version with EGC gearbox it produces 109 g/km of CO2 in the Saloon and 110 g/km in the SW version.

The Peugeot 508 is also available with two different front suspension configurations, with the GT model getting a more sporty set-up.