The BMW M57 engine is a 3.0-liter inline-six turbo-diesel known for its power, reliability, and smooth performance. Introduced in 1998, it features a cast-iron block, aluminum cylinder head, and common-rail direct fuel injection for precise combustion and efficiency. Producing 163–286 horsepower with torque ranging from 350 Nm to 580 Nm, the M57 delivers strong low-end torque and smooth acceleration. Its robust internals and engineering allow for high tuning potential and long-term durability, with many engines exceeding 300,000 kilometers.