F26 · X4

What the F26 Chassis Is

The BMW F26 designates the original BMW X4, a Sports Activity Coupe produced from 2015 through 2018. Built on the same platform as the F25 X3, the F26 lowered the roofline and added a fastback rear to create a sportier, more style-driven alternative to its more upright sibling. It slotted into BMW's lineup alongside the larger X6, giving buyers a compact coupe-crossover with genuine driving character and all-wheel-drive traction. If you're researching a specific car, run the numbers through our VIN decoder to confirm the exact build and options.

Models and Body Styles

Every F26 sold in the U.S. wore the five-door coupe-crossover body with standard xDrive all-wheel drive. Three variants were offered:

• X4 xDrive28i — the volume model, powered by a turbocharged four-cylinder.
• X4 xDrive35i — the six-cylinder step-up, favored by enthusiasts for its smoothness and pull.
• X4 M40i — the M Performance flagship, adding more power, tuned suspension, and sharper responses.

Engines and Drivetrains

The F26 relied on BMW's proven modern turbocharged engine families, all paired with the ZF eight-speed automatic and xDrive. The xDrive28i used the N20 2.0-liter turbo four, while the xDrive35i and M40i were motivated by the N55 3.0-liter single-turbo inline-six. The M40i's version of the N55 was tuned for higher output, delivering the strongest performance of the range. These powertrains represent the direct-injection, turbocharged era of BMW engineering — you can explore how they fit into the broader BMW DNA lineage on our reference page.

Owning and Buying an F26

As a used purchase, the F26 offers a lot of BMW character in a practical package, though the coupe roofline trades some rear headroom and cargo height for style. The N20 four-cylinder cars are the most affordable to buy and run, while the N55 six-cylinder cars — especially the M40i — command a premium and reward drivers who want more urgency. When shopping, verify service history for the turbocharger, cooling system, and timing components, and confirm the xDrive system operates smoothly.

Strengths and Considerations

• Strengths: Engaging handling for a crossover, strong turbo powertrains, standard all-wheel drive, and distinctive styling.
• Considerations: Reduced practicality versus the X3, and higher running costs typical of turbocharged BMWs as they age.

Enthusiasts cross-shopping BMW's turbo era often look at contemporaries built on other platforms, such as the E60 5 Series and the E63 coupe, to understand how BMW's chassis engineering evolved into the F-generation crossovers like the F26.