Used 2018 BMW 3 Series Sedan Trims Comparison

The 320i is the most affordable way into a 3 Series, but it lacks many standard and optional creature comforts. It starts with a turbocharged 2.0-liter four-cylinder engine (180 horsepower, 200 pound-feet of torque) and a choice of a six-speed manual or an eight-speed automatic transmission. Standard feature highlights include 17-inch wheels, remote locking and unlocking, push-button start, automatic wipers, dual-zone automatic climate control, premium vinyl upholstery, BMW Assist emergency telematics, Bluetooth connectivity, the iDrive infotainment interface, a 6.5-inch display and a nine-speaker sound system.

The 330i has a more powerful 2.0-liter engine (248 hp, 258 lb-ft of torque) as well as LED headlights, power-adjustable front sport seats, power-folding and heated side mirrors, auto-dimming mirrors, paddle shifters for automatic transmission-equipped models, driver-seat memory settings and split-folding rear seatbacks.

The 328d and 330e sedans come similarly equipped. Both use a turbocharged 2.0-liter four-cylinder engine paired only to the eight-speed automatic, but the 328d engine uses diesel fuel and generates 180 hp and 280 lb-ft of torque. The 330e engine takes conventional gasoline but is augmented by an electric motor for a combined 248 hp and 310 lb-ft of torque.

The 328d and 330i wagons are equipped like the sedans and also come with a panoramic sunroof, roof rails, a power liftgate and the eight-speed automatic transmission.

Finally, the 340i sedan has a turbocharged 3.0-liter six-cylinder engine (320 hp and 330 lb-ft), the contents of the Premium package (see below), keyless entry and ignition, a sunroof and a 16-speaker Harman Kardon audio system (optional on most other models). The M Sport package (see below) is also standard, but its contents can be replaced by those from the Sport or Luxury package.

There are several option packages for the 2018 3 Series. In our opinion, the main ones to look out for are the Premium and the Executive since they further equip the 3 Series with a host of desirable convenience and tech-oriented extras. The Premium package, for example, adds heated front seats, a head-up display, a navigation system, a 8.5-inch display screen and BMW's Remote Services (can lock and unlock doors or find car in a parking lot via smartphone app). The Executive package adds adaptive LED headlights, side- and top-view parking cameras, and upgraded leather upholstery.

Other popular picks include the Track Handling package (improves handling and steering) and the Driving Assistance package that adds many advanced driver safety aids.