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2018 BMW 4 Series Convertible 440i xDrive

The 2018 BMW 4 Series Convertible 440i xDrive is a 320-hp 3.0-liter turbocharged inline-6 convertible with an 8-speed sport automatic and all-wheel drive. It starts at $60,700 MSRP and is rated at 23 mpg combined.

It makes 320 horsepower at 5,500 rpm and 330 lb-ft of torque at 1380 rpm. EPA fuel-economy estimates are 20 mpg city and 29 mpg highway (23 mpg combined).

The 4 Series Convertible measures 182.6 inches long on a 110.6-inch wheelbase and has a curb weight of 4,270 lb.

Spec Value
Vehicle
Body TypeConvertible
PowertrainGas
Price
MSRP$60,700
MSRP with Destination$61,695
Destination Charge$995
Engine
Engine Type3.0L Inline-6 24V TwinPower Turbo
Displacement3 L
Horsepower320 hp @ 5,500 rpm
Torque330 lb-ft @ 1380 rpm
Injection TypeGasoline Direct Injection
Drivetrain
Drive TypeAWD (xDrive)
Transmission
Transmission8-speed Sport Automatic (Steptronic)
1st Gear4.71
2nd Gear3.14
3rd Gear2.11
4th Gear1.67
5th Gear1.28
6th Gear1
7th Gear0.84
8th Gear0.67
Reverse3.29
Final Drive3.15
Fuel Economy
City20 MPG
Highway29 MPG
Combined23 MPG
Recommended FuelPremium
Tank Capacity15.8 gal
Suspension
Front SuspensionStrut
Rear SuspensionMulti-Link
Turning Diameter37.1 ft
Brakes
Front Brake Disc13.4 in (vented)
Rear Brake Disc13.0 in (vented)
Tires & Wheels
Wheels Front18 x 8 in
Wheels Rear18 x 8 in
Tires Front225/45R18
Tires Rear225/45R18
Dimensions & Weight
Length182.6 in
Width71.9 in
Height54.5 in
Wheelbase110.6 in
Front Track60.8 in
Rear Track62.8 in
Cargo Volume7.8 ft³
Curb Weight4,270 lbs
Interior
Headroom Front40.4 in
Headroom Rear37.1 in
Legroom Front42.2 in
Legroom Rear33.1 in
Shoulder Room Front55.3 in
Shoulder Room Rear49.8 in

Safety & Recalls

NCAP safety ratings

Tested, but no star ratings were published (2018 BMW 4 Series 2 DR AWD).

Recalls

No recalls on file with NHTSA for the 2018 BMW 4 SERIES.

34 owner complaints to NHTSA for the 2018 BMW 4 SERIES

Owner Complaints

34 owner complaints filed with NHTSA for the 2018 BMW 4 SERIES (5 mention a crash, 2 a fire, 6 an injury). See all on nhtsa.gov

Most-cited areas
Engine10
Engine And Engine Cooling7
Electrical System6
Unknown Or Other5
Seat Belts4
Seats3
A complaint can cite more than one area.
Most recent complaints
Apr 23, 2025 · Seat Belts
“Seatbelt alert pops up and noise sounds even when seatbelt is already buckled”
Mar 18, 2025 · Engine And Engine Cooling, Electrical System
“The contact owns a 2018 BMW 430I. The contact stated that while the vehicle was parked, the contact discovered that there was an unknown liquid leaking underneath the vehicle. The coolant warning…”
Jan 17, 2025 · Engine And Engine Cooling
“The contact owns a 2018 BMW 430I. The contact stated while driving at an undisclosed speed, the vehicle lost motive power. The vehicle was restarted; however, the failure persisted. The vehicle was…”
Dec 13, 2024 · Electrical System, Service Brakes, Engine Crash
“I pulled out onto Southside Blvd. My brakes failed, my driver’s front of the car hit a Waste Management garbage truck right back tire and cut the sidewall of the tire. The engine was racing, the truck…”
Dec 5, 2024 · Engine And Engine Cooling
“The contact owns a 2018 BMW 430I. The contact stated while driving at an undisclosed speed, the engine started overheating with the low coolant warning light illuminated. The contact parked and left…”

Complaints are unverified reports submitted to NHTSA by owners. They cover the whole model year, not a specific trim, and a count alone doesn't show how common a problem is.

Source: US National Highway Traffic Safety Administration (nhtsa.gov), matched as 2018 BMW 4 SERIES. US-market vehicles only; data cached for up to 7 days.

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