This page lists the full technical specifications for the 2026 BMW 3 Series sedan: engine output, exterior and interior dimensions, curb weight, fuel economy, features by trim, and warranty coverage. For plain-language context, see the 3 Series overview; for pricing and equipment by build, see the trims comparison. BMW of Napa Valley in Fairfield stocks the lineup for drivers across Solano County and Northern California, from Vacaville and Vallejo to American Canyon, with easy access off I-80.

Powertrain

Engine Specifications

330i: 2.0L TwinPower Turbo 4-cylinder

The 330i uses a 2.0L TwinPower Turbo 4-cylinder with 48-volt mild-hybrid assistance, producing 255 horsepower and 295 lb-ft of torque through an 8-speed automatic. It reaches 60 mph in about 5.6 seconds.

M340i: 3.0L M TwinPower Turbo inline 6-cylinder

The M340i uses a 3.0L M TwinPower Turbo inline 6-cylinder with 48-volt mild-hybrid assistance, producing 386 horsepower and 398 lb-ft of torque through an 8-speed automatic. In xDrive form it reaches 60 mph in about 4.1 seconds.

Engine	Horsepower	Torque	Transmission	0-60 mph
330i 2.0L turbo 4-cylinder	255 horsepower	295 lb-ft	8-speed automatic	About 5.6 seconds
M340i 3.0L turbo 6-cylinder	386 horsepower	398 lb-ft	8-speed automatic	About 4.1 seconds (xDrive)

Outside

Exterior Dimensions

Measurement	Figure
Length	About 185.7 inches
Width (without mirrors)	71.9 inches
Height	56.8 inches (57.0 inches with xDrive)
Wheelbase	112.5 inches
Turning radius	18.7 feet
Base curb weight (330i)	3,644 pounds
GVWR	4,718 pounds

Curb weight shown is the rear-wheel-drive 330i; xDrive and the M340i weigh more.

Inside

Interior Dimensions

The 3 Series seats five, with 16.9 cubic feet of trunk space and a 40/20/40 split-folding rear seat.

Measurement	Front	Rear
Headroom	38.7 inches	37.6 inches
Legroom	42.0 inches	35.2 inches
Shoulder room	56.0 inches	54.6 inches

Chassis

Wheels, Tires, and Brakes

The 330i rides on 18-inch wheels; the M340i steps up to 19-inch wheels and adds M Sport Brakes and an M Sport Differential. Tire sizes vary by wheel and package.

Build	Standard Wheels	Brakes
330i	18-inch	Standard disc brakes
M340i	19-inch	M Sport Brakes

Efficiency

Fuel Economy and Range

Build	EPA-Estimated MPG	Fuel Tank
330i (rear-wheel drive)	28 MPG city / 35 MPG highway / 31 MPG combined	15.6 gallons
M340i	29 MPG combined	15.6 gallons

At its EPA-estimated 31 MPG combined and a 15.6-gallon tank, the 330i is good for an estimated 480 miles of combined driving range between fills. Actual mileage and range vary with conditions, equipment, and drivetrain.

At a Glance

Key Features by Trim

A quick decision grid of the equipment shoppers ask about most. For the full per-build breakdown and step-up pricing, see the trims comparison.

Feature	330i	M340i
Moonroof	S	S
Wireless device charging	S	S
Heated front seats	S	S
14.9-inch touchscreen	S	S
Blind-spot warning	—	S
Rear cross-traffic alert	—	S
Front and rear parking sensors	—	S
Remote start	—	S
Proximity keyless entry	—	S
M Sport Differential	—	S
Driving Assistance Professional	O	O
Harman Kardon sound system	O	O

Legend: S = standard · O = available · — = not standard equipment.

Driver Assistance

Safety and Compliance

Forward collision mitigation and lane keeping assistance are standard on every 2026 3 Series. The M340i adds standard blind-spot warning, rear cross-traffic alert, lane departure warning, and front and rear parking sensors. The available Driving Assistance Professional package adds Active Cruise Control with Stop and Go, Active Lane Keeping Assistant, Traffic Jam Assistant, and Evasion Aid.

Coverage

Warranty Coverage

Coverage	Term
New Vehicle Limited (bumper-to-bumper)	4 years / 50,000 miles
Powertrain	4 years / 50,000 miles
Rust perforation	12 years / unlimited miles
Roadside assistance	4 years / unlimited miles
BMW Ultimate Care scheduled maintenance	3 years / 36,000 miles

For maintenance intervals and long-term ownership costs, see the 3 Series maintenance guide. Confirm current warranty terms with the dealership.

Decoded

What These 2026 BMW 3 Series Numbers Mean in Practice

Numbers on a page only matter when they touch daily life. Here is what the key figures translate to.

Figure	What It Means
185.7-inch length	Fits a standard 20-foot garage bay with room to open the trunk, and parks easily in a typical space.
71.9-inch width	Comfortably clears a standard single-car garage door; add mirror width when judging tight spaces.
35.2-inch rear legroom	Fine for two adults on a normal trip; tighter behind a tall front-seat occupant on a long haul.
16.9 cubic feet of trunk	Large for a compact luxury sedan; the 40/20/40 rear seat folds for longer items.
About 480 miles of range	Enough for a round trip across Northern California on one tank in the 330i.

Answers

Specifications FAQs

Explore the 2026 BMW 3 Series Research Hub