M57D30

The M57D30 is a family of inline-six diesel engines developed by BMW. Introduced in 1998, these engines are known for their robust construction, smooth operation, and fuel efficiency. They feature common rail direct injection and a variable geometry turbocharger, which contribute to their strong performance and responsiveness across a wide RPM range.

Several variants of the M57D30 exist, differing primarily in power output and emissions control technology. Early versions focused on performance, while later iterations incorporated advanced emissions systems like diesel particulate filters (DPFs) and selective catalytic reduction (SCR) to meet increasingly stringent environmental regulations. The engine block is typically made of cast iron, and the cylinder head is made of aluminum.

The M57D30 has been widely used across BMW's model lineup, including the 3 Series, 5 Series, 7 Series, and X models. It has also been found in some Land Rover and Opel vehicles through BMW's former partnerships. Despite its widespread use and reputation for reliability, like any engine, it can experience issues such as injector problems, turbocharger wear, and swirl flap failures, particularly in high-mileage examples. Maintenance, including regular oil changes and fuel filter replacements, is crucial for longevity.