Buyer's Guide

2021 BMW 4-series
Select a Different Model (5 Available): 430i Convertible
Fuel Economy $ 23 / 34 mpg
Horsepower 255@5,000
Torque 295@1,550
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  • Excellent turbo inline-six
  • 430i's good fuel economy
  • Apple CarPlay and Android Auto now standard


  • That ridiculously large grille
  • Higher base price than almost every competitor
  • Finicky gesture control

It was formerly just the coupe and convertible version of the 3 Series sedan, but the 4 Series has grown to include a stylish four-door hatchback, too. Now in its second generation since it became a separate model in the 2014 model year, the 4 Series continues to be the style-focused model. However, BMW has designed a massive grille on what's otherwise a pretty car, causing divided opinions and plenty of cringes from those not used to the new look.

A convertible with a power-operated soft top replaces the retractable hard top. The four-door coupe-like hatch called the Gran Coupe should arrive in dealerships after the two-door coupe and convertible models. Like its predecessor, the new 4 Series comes in RWD or AWD configurations and plenty of power no matter which model you choose.

Looking for a 4 Series with a couple extra doors? Check out the four-door hatchback 4 Series Gran Coupe, coming for the 2022 model year.

What We Think

The newest iteration of the BMW 4 Series is more than just its controversial oversized front grille, but no evaluation would be complete without mention of it. BMW, what were you thinking? If you can get beyond the styling, though, the 4 Series in M440i guise drives better than it looks. Ride quality is much more comfortable than and just as compliant as most M- or M-Sport BMWs we've driven as of late. We experienced more of a grand touring experience than that of a sport coupe. Especially with AWD, though, it's balanced but reluctant to rotate and it lacks any steering feel. A turn in the turbo 2.0L four-cylinder 430i RWD revealed more letdowns, namely uninspired interior design and a competent driving experience without much sizzle or comfort.

The M440i's turbo inline-six is a sweetheart of an engine, though. Acceleration is brisk and the automatic transmission delivers quick, smooth shifts. Driving the 4 Series, you're encouraged to wring every last ounce of power from the engine. So it's a luxury grand tourer happy to waft along the interstate and indulge full-throttle acceleration pulls. The 4 Series is a solid BMW, as long as you don't have to look at it.

Performance and Fuel Economy

Two engines are available in the 2021 4 Series, and both are paired exclusively to an eight-speed automatic transmission.

Model: 430i and 430i xDrive
Engine and Transmission: 
2.0-liter turbo I-4 - eight-speed automatic
255 hp/294 lb-ft of torque
EPA-Rated Fuel Economy:
26/34 mpg city/highway (430i Coupe); 24/33 mpg (430i xDrive Coupe)

Model: M440i xDrive
Engine and Transmission: 
3.0-liter turbo I-6 - eight-speed automatic
382 hp/364 lb-ft
EPA-Rated Fuel Economy: 22/31 mpg (M440i xDrive Coupe)
Acceleration (0-60 mph): 4.0 seconds


BMW's Active Driving Assistant suite of driver assistance features is standard on every 2021 4 Series. That package combines lane departure warning, blind-spot monitoring, rear cross-traffic alert, pedestrian detection, forward collision warning, and automatic high beams, as well as front and rear automatic emergency braking. The Driving Assistance Professional package builds on the standard active safety technologies with traffic jam assist, evasion assist, front cross-traffic alert, adaptive cruise control, and lane keeping assist with side collision avoidance.


BMW's latest infotainment system features standard wireless Apple CarPlay and Android Auto compatibility, a 5.1-inch instrument cluster display, built-in navigation, and an 8.8-inch main touchscreen. You can upgrade to a 12.3-inch digital cluster and a 10.3-inch touchscreen via the Premium or Executive package (the latter includes the Premium package). Other available tech features include a head-up display, wireless charging, a wi-fi hotspot, and a 16-speaker Harman Kardon surround sound system.

Cool Feature

The M440i xDrive features a 48-volt mild hybrid system for improved efficiency. The car stores energy gathered when slowing down or braking in a 48-volt battery to power the multimedia system or even provide quick bursts of extra power. As a result, the engine can motivate the vehicle more efficiently because it doesn't need to dedicate as much power to run the car's other systems. The 48-volt starter generator can also engage the engine stop/start system when it senses the car is below 9 mph and the driver is braking to a stop.

Key Competitors:

Engine Name
Engine: 4-Cyl Turbo 2.0 Liter
Transmission Name
Transmission, Steptronic 8 Speed Automatic Mode Select with Manual Mode (8HP50)
430i Convertible
Premium Convertible
Standard MPG
Body Style
Fuel Type
Unleaded Premium
Seating Capacity
Package Invoice Retail
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IIHS Best Pick
NHTSA Rating Front Driver
Not Rated
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NHTSA Rating Front Passenger
Not Rated
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NHTSA Rating Front Side
Not Rated
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NHTSA Rating Overall
Not Rated
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NHTSA Rating Rear Side
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NHTSA Rating Rollover
Not Rated
Amount Description Expiry Date
$0 0.9% Financing available for varying term lengths : 36, 48, 60 Months - BMW announces APR rates on select models. [Regional Incentive. See dealer for availability.] 06-30-2021
$0 1.9% Financing for a maximum term of 72 Months - BMW announces APR rates on select models. [Regional Incentive. See dealer for availability.] 06-30-2021
$2500 BMW announces a Military Program for cash customers. 12-31-2021
$500 BMW announces a Military Program for customers who Lease/OwnersChoice/Retail Finance/Select Finance through BMW Financial Services that is good towards a purchase or lease of select models. 12-31-2021
$1000 BMW announces Lease/APR Credit on select models for eligible College Graduates. 01-03-2022