The first generation of BMW 3 series (E21) was produced from 1975 to 1982 and featured a 2-door sedan design.
The E30 3 Series, introduced in 1982, had a unique headlight design that used a single unit on each side, rather than the dual headlamps found on other cars of the time.
In 1990, BMW developed a high-performance version of the 318i, known as the "DINAN S1", which produced 175 horsepower and was not officially sanctioned by the company.
The E36 3 Series (1992-1999) featured an innovative system called "Active Steering" that used an electric motor to adjust the steering gear ratio based on speed and driver input.
A 318iS model of the E36 was produced with a sport-tuned suspension, 15-inch alloy wheels, and a rear spoiler as standard equipment.
In the late 1990s, BMW developed a concept for an all-wheel-drive version of the 3 Series, which would have used a system called "xDrive" that predated the current xDrive system.
A limited-production model known as the M3 Evolution (E30) was produced in 1988 to compete with the Ford RS200 and Volkswagen Corrado GTI.
The E46 3 Series (1999-2006) featured a "Dynamic Stability Control" system that used sensors to monitor wheel speed, steering angle, and accelerator pedal position to adjust engine power and brake application.
A special edition of the E46 M3 was produced with a naturally aspirated engine producing 333 horsepower and a six-speed manual transmission as standard equipment.
The E90/E92 3 Series (2006-2013) featured a system called "Driver's Information System" that provided real-time fuel consumption information, navigation data, and other driver-related info on the dashboard screen.
A limited-production model known as the BMW M3 GTS was produced in 2010 with a V8 engine producing 444 horsepower and an interior design inspired by rally cars.
The F30/F31 3 Series (2012-2019) featured a system called "Adaptive M Suspension" that used an electro-mechanical system to adjust damping based on road conditions, driver input, and vehicle speed.
A high-performance version of the F30 was produced with a twin-turbocharged engine producing 365 horsepower and all-wheel drive as standard equipment.
In 2017, BMW unveiled a hybrid concept for the 3 Series known as the "BMW Concept M8", which featured a V8 engine combined with an electric motor to produce 710 horsepower.
A limited-production model known as the BMW M3 CS was produced in 2018 with a twin-turbocharged engine producing 460 horsepower and all-wheel drive as standard equipment.
The G20/G21 3 Series (2019-present) features advanced safety systems such as "Lane Departure Warning" and "Active Driving Assistant", which use cameras, radar, and ultrasonic sensors to monitor the road and driver.
A high-performance version of the G20 was produced with a twin-turbocharged engine producing 473 horsepower and all-wheel drive as standard equipment.
BMW has announced plans to produce an electric version of the 3 Series known as the "BMW i4", which will feature a dual-motor setup and a battery pack expected to provide over 250 miles of range.
The G20 features a new system called "Driving Assistant Professional" that integrates adaptive cruise control, lane departure warning, and other advanced safety features into a single system.
BMW has produced special edition models for the 3 Series in collaboration with companies like Alpina, Hartge, and Dinan, often featuring unique engine upgrades, suspension modifications, and exterior styling cues.