BMW X3 M40i vs X3 M
X3 M40i or X3 M? Side-by-side specifications from the original factory data: engine, power, economy, dimensions and weight.
| Parameter | X3 M40i | X3 M |
|---|---|---|
| Engine | 6-cyl · 3.0L · turbo · Premium Gasoline | 6-cyl · 3.0L · turbo · Premium Gasoline |
| Displacement, cc | 3000 | 3000 |
| Cylinders | 6 | 6 |
| Power, hp | 382 | 503 |
| Transmission | Automatic (S8) | Automatic (S8) |
| Drivetrain | All-Wheel Drive | All-Wheel Drive |
| Parameter | X3 M40i | X3 M |
|---|---|---|
| MPG city | 21 | 15 |
| MPG highway | 26 | 20 |
| MPG combined | 23 | 17 |
| CO₂, g/mile | 378 | 519 |
| Parameter | X3 M40i | X3 M |
|---|---|---|
| Length, in | 185.4 | 185.4 |
| Width, in | 74.4 | 74.4 |
| Height, in | 66.1 | 66.1 |
| Wheelbase, in | 112.6 | 112.6 |
| Parameter | X3 M40i | X3 M |
|---|---|---|
| Curb weight, lb | 4228 | — |
Figures based on official manufacturer materials. Actual values may vary by configuration and market.
What the table shows
The two columns are a 2024 X3 M40i and a 2024 X3 M, taken from the specification cards behind this site rather than from a manufacturer’s press release. The starting version of a shared model year is used on both sides, so the comparison is base against base.
- Power: the X3 M is more powerful by 121 hp — 503 against 382, 32% more.
- Combined economy: the X3 M40i is more economical by 6 mpg — 23 against 17, 35% more.
Identical on length (185.4 in) — which is worth as much as the differences when deciding between them.
The X3 M40i uses the B58, a 3.0-litre turbocharged six; the X3 M the S58, a 3.0-litre turbocharged six. Both drive all four wheels.
Rows the table leaves blank are figures neither card carries. Torque, acceleration and top speed are not collected by any US government source and appear on this site only where an original factory brochure printed them, so they are missing more often on recent cars than on older ones.