BMW X4 vs X6
X4 or X6? Side-by-side specifications from the original factory data: engine, power, economy, dimensions and weight.
| Parameter | X4 | X6 |
|---|---|---|
| Engine | 4-cyl · 2.0L · turbo · Premium Gasoline | 6-cyl · 3.0L · turbo · Premium Gasoline |
| Displacement, cc | 2000 | 3000 |
| Cylinders | 4 | 6 |
| Power, hp | 248 | 335 |
| Transmission | Automatic (S8) | Automatic (S8) |
| Drivetrain | All-Wheel Drive | All-Wheel Drive |
| Parameter | X4 | X6 |
|---|---|---|
| MPG city | 23 | 21 |
| MPG highway | 29 | 25 |
| MPG combined | 25 | 23 |
| CO₂, g/mile | 351 | 389 |
| Parameter | X4 | X6 |
|---|---|---|
| Length, in | 187.4 | 194.9 |
| Width, in | 75.6 | 78.7 |
| Height, in | 63.8 | 66.9 |
| Wheelbase, in | 113.0 | 116.9 |
| Parameter | X4 | X6 |
|---|---|---|
| Curb weight, lb | 4147 | 4795 |
Figures based on official manufacturer materials. Actual values may vary by configuration and market.
What the table shows
The two columns are a 2021 X4 and a 2021 X6, 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 X6 is more powerful by 87 hp — 335 against 248, 35% more.
- Curb weight: the X6 is heavier by 648 lb — 4,795 against 4,147, 16% more.
- Combined economy: the X4 is more economical by 2 mpg — 25 against 23, 9% more.
- Length: the X6 is longer by 7.5 in — 194.9 against 187.4, 4% more.
The X4 uses the B48, a 2.0-litre turbocharged four; the X6 the B58, 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.