Major changes included:
In 2008, BMW introduced its new, entry-level luxury car, dubbed the 1 Series. Topping out the 1 Series range, with exception to the M model, was the 135i. The 135i came in a convertible or coupe format, and carried the same basic body style as the rest of the BMW lineup. Under the first-gen 135i's hood was a twin-turbocharged 3-liter inline six-cylinder engine that produced 300 horsepower and 300 pound-feet of torque. In 2011, BMW replaced the twin-turbo engine with a TwinPower Turbo 3-liter engine that used a single twin-scroll turbo in place of the two turbochargers, which increase efficiency while maintaining the same power ratings. The 2012 model received a mildly refreshed fascia with new headlights.