The BMW M54 is a naturally aspirated straight-6 DOHC petrol engine produced from 2000 to 2006. It was released in the E53 X5 and is the replacement for the M52 engine. The S54 is the equivalent high performance engine, used in the E46 M3, the Z3 M Coupé/Roadster and the E85/E86 Z4 M. The BMW M56 SULEV engine is based on the M54.

The BMW E53 is the first generation BMW X5 mid-size luxury crossover SUV. The vehicle was the first SUV ever produced by BMW. It was produced between 1999 and 2006 and was replaced by the E70 X5.