Two engines cover the entire 2027 BMW 4 Series range below the M4: a 2.0-liter turbocharged four making 255 horsepower and 295 lb-ft, and a 3.0-liter turbocharged inline-six making 386 horsepower and 398 lb-ft. Both are new for this model year in one important way. Both now run a 48-volt mild-hybrid system, and on the six that system is part of the quoted power figure.

This is where the 4 Series powertrain is covered in full: what each engine actually does, how the eight-speed gearbox and the xDrive system behave, the full engine-to-body matrix, the fuel economy that follows from each combination, and which one suits which driver. Trim pricing and equipment live on the trims page; dimensions live on the specs page.

2027 BMW 4 Series Engines at a Glance

Engine	Displacement	Horsepower	Torque	Found in
2.0L TwinPower Turbo I4	1,998 cc	255 bhp	295 lb-ft	430i, 430i xDrive
3.0L M TwinPower Turbo I6	2,998 cc	386 bhp	398 lb-ft	M440i, M440i xDrive

2027 BMW 4 Series Engine-by-Engine

The 2.0-liter four in the 430i

255 horsepower sounds modest next to the six until you look at where the torque arrives: all 295 lb-ft is available from 1,600 rpm and holds to 4,500. That is the entire range you use in traffic on Interstate 80, which is why the 430i never feels like it is working. It pulls a 3,677-pound coupe to 60 mph in 5.6 seconds, 5.4 with xDrive, and returns an EPA-rated 28 city / 36 highway / 31 combined in rear-drive form. That combined figure is the best in the family by two miles per gallon and the reason the 430i is the volume car.

The 3.0-liter six in the M440i

386 horsepower at 5,200 to 6,250 rpm, and 398 lb-ft from 1,900 rpm. BMW breaks the power figure down explicitly: 375 horsepower from the combustion engine plus up to 11 horsepower of electric drive from the mild-hybrid system. That is worth knowing, because it means the last few horsepower arrive as instant electric assist rather than as revs.

The result is a car that is a second and a half quicker than the four to 60 mph while giving up only two combined miles per gallon. An M440i xDrive Coupe runs 4.2 seconds; the rear-drive M440i does 4.6 as a coupe or a Gran Coupe, and 5.0 as a convertible. The inline-six is also the reason people come looking for this car specifically: the smoothness of a straight six and the sound that goes with it.

What the 48-volt mild hybrid does, and what it does not

It smooths the stop-start, fills the gap below the turbo, and on the six it contributes up to 11 horsepower. It does not plug in, it stores very little energy, and the car has no electric-only range. If you want a 4 Series that runs on electricity, that is the i4, and it is a different car with a different powertrain.

2027 BMW 4 Series Transmissions and Drive Systems

Every 430i and M440i uses the same eight-speed Sport Automatic, with Sport and Manual shift modes, steering-wheel paddle shifters and Launch Control. Every 430i and M440i pairs its engine with the eight-speed Steptronic Sport automatic, with paddle shifters on the wheel; the six-speed manual is the M4's own.

Rear-wheel drive is standard on both engines. BMW's xDrive all-wheel drive is available on both, and the choice costs $2,000 on a 430i coupe. It also changes the car's numbers in three ways: two tenths quicker to 60 mph, one combined mile per gallon lower, and 128 pounds heavier. The xDrive cars also sit two tenths of an inch taller and turn in a two-foot wider circle.

On the roads that matter here, that trade is usually worth it. The climbs between Napa and Vallejo and the wet-season runs along Highway 12 are where xDrive makes the difference, and it removes the question entirely.

2027 BMW 4 Series Engine and Body Matrix

Configuration	Engine	Drive	0-60 mph
430i Coupe	2.0L I4	RWD	5.6 sec
430i xDrive Coupe	2.0L I4	AWD	5.4 sec
430i Gran Coupe	2.0L I4	RWD	5.8 sec
430i xDrive Gran Coupe	2.0L I4	AWD	5.7 sec
430i Convertible	2.0L I4	RWD	6.0 sec
430i xDrive Convertible	2.0L I4	AWD	5.9 sec
M440i Coupe	3.0L I6	RWD	4.6 sec
M440i xDrive Coupe	3.0L I6	AWD	4.2 sec
M440i Gran Coupe	3.0L I6	RWD	4.6 sec
M440i Convertible	3.0L I6	RWD	5.0 sec
M440i xDrive Convertible	3.0L I6	AWD	4.6 sec

2027 BMW 4 Series Fuel Economy by Engine

Configuration	City	Highway	Combined
430i Coupe	28	36	31
430i xDrive Coupe	27	34	30
430i Convertible	27	35	30
430i xDrive Convertible	24	33	28
M440i Coupe	27	34	30
M440i xDrive Coupe	26	33	29
M440i Convertible	27	33	29
M440i xDrive Convertible	26	32	28

EPA estimates, published at fueleconomy.gov. The spread from best to worst across every gas 4 Series is three combined miles per gallon, which is narrower than most shoppers expect between a four and a six.

Which 2027 BMW 4 Series Engine Is Right for You?

• Daily commuting and the best economy: the 430i, 31 mpg combined and 295 lb-ft from 1,600 rpm. See 4 Series inventory.
• Year-round grip on the hill roads: the 430i xDrive, two tenths quicker and one mpg thirstier.
• You want the six and drive mostly dry roads: the rear-drive M440i, 4.6 seconds, and the same 30 mpg combined as a 430i xDrive coupe.
• Quickest without stepping to M: the M440i xDrive Coupe, 4.2 seconds.
• You want the S58 race engine: that is the M4, from 473 to 523 horsepower, and it is built for a different kind of drive.

Shop the 2027 BMW 4 Series at BMW of Napa Valley

The four and the six are genuinely different cars to drive, and twenty minutes behind each settles it faster than any spec table. BMW of Napa Valley is on Auto Mall Parkway in Fairfield, straight off Interstate 80 and convenient to Vacaville, Vallejo, Suisun City, American Canyon and Napa. Call (707) 402-1500 or book a back-to-back test drive.

2027 BMW 4 Series Engine FAQ

What engine is in the 2027 BMW 430i?

A 2.0-liter TwinPower Turbo inline-four of 1,998 cc, making 255 bhp at 4,700 to 6,500 rpm and 295 lb-ft from 1,600 to 4,500 rpm, with a 48-volt mild-hybrid system.

What engine is in the 2027 BMW M440i?

A 3.0-liter M TwinPower Turbo inline-six of 2,998 cc, making 386 bhp at 5,200 to 6,250 rpm and 398 lb-ft from 1,900 to 4,800 rpm. BMW breaks the 386 down as 375 hp from the engine plus up to 11 hp of electric drive.

Do I ever need to charge the 48-volt system?

No. It recovers its own energy under braking and coasting and manages itself. There is no plug, no charge port and no electric-only range on any 430i or M440i.

Does the 2027 BMW 4 Series come with a manual transmission?

Not below the M4. Every 430i and M440i uses the eight-speed Sport Automatic with paddle shifters. The base M4 Coupe is the one 4 Series family member offered with a six-speed manual.

How much quicker is the M440i than the 430i?

About a second and a half. An M440i xDrive Coupe runs 0-60 mph in 4.2 seconds against 5.6 for a rear-drive 430i Coupe.

What fuel does the 2027 BMW 4 Series take?

Premium gasoline is recommended for both engines.

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