The S54 is BMW's modular turbocharged inline-six petrol engine, in production since 2015. It's one of the most widely-deployed engines in the current BMW range, fitted across every mainstream model line from the 2 Series up to the flagship 8 Series and X7, plus the new XM and the Z4 roadster. Beyond BMW itself, the same engine family (in modified form) is also used by Toyota in the GR Supra — a detail worth knowing if you're researching this engine's reputation more broadly, though our work here covers BMW-badged applications specifically.

Because the S54 spans 14 different models and multiple generations — some in standard petrol form, others as mild-hybrid or plug-in hybrid applications — compatibility comes down to confirming your exact model, generation, and drivetrain spec, which we do by registration. A S54 from a 2 Series isn't a drop-in match for a S54 from an X7, even though it's the same base engine code — ancillaries, mounting, and hybrid-system integration all differ. Before we quote or supply anything, we confirm your exact vehicle.