Used 2020 BMW 3 Series Sedan Trims Comparison

The 330i comes standard with a turbocharged 2.0-liter four-cylinder engine (255 horsepower, 295 lb-ft of torque), an eight-speed automatic transmission and rear-wheel drive. All-wheel drive (known as xDrive) is optional.

Standard features include 18-inch wheels, automatic wipers, a sunroof, simulated leather upholstery, tri-zone automatic climate control, an auto-dimming rearview mirror, power-adjustable front seats, an 8.8-inch touchscreen display, a navigation system, Apple CarPlay, Bluetooth, two USB inputs and a 10-speaker audio system.

Forward collision warning with automatic emergency braking, lane departure warning and BMW Assist emergency communications are among the driver assistance features that come standard.

More power is available with the M340i, which comes standard with a six-cylinder engine (382 hp, 369 lb-ft), an eight-speed automatic transmission and rear-wheel drive. All-wheel drive is optional.

Standard features for the M340i are similar to the 330i's but also include sport-tuned brakes and suspension, a 10.25-inch touchscreen display, and a digital gauge cluster display (called Live Cockpit Professional).  BMW's Connected Package Professional, which combines remote and concierge services with real-time traffic information, is also included.

Both trim levels offer several stand-alone options and a handful of option packages, the most notable being the Premium and Executive packages. The Premium package adds heated front seats, a heated steering wheel and a head-up display. The Executive package adds upgraded adaptive LED headlights, surround and bird's-eye parking camera views, parking sensors, an automated self-parking system, and gesture control functions for the infotainment system.

Additional safety can be had by way of the Driving Assistance and Driving Assistance Professional packages. The former adds blind-spot monitoring and rear cross-traffic alert to the standard set of driver aids, while the latter equips adaptive cruise control, lane keeping assist, active front cross-traffic alert, and Traffic Jam Assist, a semi-automated steering system. For enhanced performance, BMW offers a package that bundles high-performance tires and improved engine cooling.

Some of the above features are available as stand-alone options. Other individual items include 19-inch wheels, an adaptive suspension, leather upholstery, hands-free trunk opening, ambient cabin lighting, wireless device charging, a Wi-Fi hotspot, and a premium Harman Kardon audio system.