Limited to approximately 300 US-market examples, the M4 CSL combines the lightened G82 configuration with carbon-fiber body panels, omitted rear seats, M Carbon bucket seats, and a model-specific suspension lowered 8mm from the M4 Competition. A brake-fluid flush was performed in September 2025, followed by an oil change and air-filter replacement before the sale. Annual mileage sits near the low end for this generation.