2023 BMW X4 M40i

SUV · 3.0L TwinPower Turbo I6 · AWD

86/100

AutoVault's overall score, weighted for what a suv is actually for — performance, technology, comfort, reliability, safety and value.

Specifications

Engine	3.0L TwinPower Turbo I6
Horsepower	382 hp
Torque	369 lb-ft
0–60 mph	4.6 sec
Top speed	155 mph
Drivetrain	AWD
Seats	5
Combined MPG	24 mpg (21 city / 27 hwy)
Range	385 miles
MSRP	$73,500
Body style	SUV

The verdict

What's good

Inline-six torque delivery is smooth and linear right from low rpm
Sport-tuned chassis balances daily comfort with track-capable sharpness
Soundtrack from the turbocharged I6 is genuinely rewarding at full throttle
iDrive 10 with curved display leads compact SUV tech segment

What's not

Coupe roofline cuts rear headroom significantly for taller occupants
Cargo volume penalty versus boxy rivals is real for family use
Firm sport suspension makes broken city pavement genuinely jarring
Ownership costs including tires and brake wear are high for daily use

The engine

B58

3.0L Turbo I6

The B58 is BMW's celebrated single-turbo straight-six — buttery smooth and effortlessly torquey, delivering power in one seamless, silken surge to redline.

Heir to a BMW inline-six bloodline running back to 1933, the B58 belongs to the modular B-series family and is so over-built it's become a tuning and engine-swap legend.

Tuners regularly push the B58 past 600 hp on its stock internals.
Toyota chose the B58 to power the latest Supra.

See the rest in AutoVault

The six sub-scores behind the 86 — performance, tech, comfort, reliability, safety and value
Market value today and year-by-year value history
All 4 trims with pricing
Studio photography — exterior, rear and interior
Side-by-side comparison with up to four cars

Open in AutoVault