Used BMW X4 Sill

No — the F26 first-generation X4 (2014–2018) and the G02 second-generation X4 (2018-onwards) are built on completely different platforms with different body structures, so their sills are not interchangeable. Always source a sill from the correct generation to match your car. Confirm the exact fit with the breaker against your registration before purchasing.

Yes, generation is the key factor — you need a sill from the matching platform, either the F26 (2014–2018) or the G02 (2018-onwards), as the body structures differ completely between the two. Within each generation, the sill pressing should be consistent, but confirm with the breaker against your registration in case of any mid-generation pressing changes. Engine choice and trim level make no difference to sill fitment.

Trim level does not affect the structural fitment of the sill itself, as the underlying body pressing is the same across SE, xLine, M Sport and M Sport X trims within the same generation. However, some trims may have different side skirt extensions or decorative mouldings that attach to or sit over the sill, so the cosmetic finish may differ. Source the sill from the correct generation and confirm any cosmetic differences with the breaker if a like-for-like appearance matters to you.

Yes — sills are handed, meaning the nearside (NS, passenger side) and offside (OS, driver side) are mirror images of each other and are not interchangeable. Make sure you identify the correct side before requesting quotes from a breaker, and double-check with them against your registration to confirm you receive the right part.

The G02 X4 received a facelift in 2021, and while the core platform remained the same, there is a possibility of subtle pressing or fitment changes around that boundary. Name the boundary confidently — pre-facelift (2018–2021) versus post-facelift (2021-onwards) — but whether a sill crosses that boundary cleanly is something you should confirm with the breaker against your specific registration before buying.

No — the sill is a body panel and its fitment is determined by generation and body structure, not by whether your X4 has a petrol, diesel, or any particular drivetrain configuration. All X4 variants within the same generation share the same sill, so you do not need to match the engine when sourcing this part.