M57 Engine

Specifications

The BMW M57 engine is a 3.0-liter inline-six turbo-diesel engine widely regarded for its durability, smoothness, and tuning potential. Built with an aluminum head and cast-iron block, it features common-rail direct injection and was produced in several power variants ranging roughly from 161 to 282 hp with torque outputs up to 580 Nm, depending on the version.

The M57 uses variable-geometry turbocharging, delivering strong low-end torque and efficient performance. Known for its robust internals, reliability, and compatibility with performance upgrades, the M57 powered many BMW models including the 3-Series, 5-Series, 7-Series, X3, and X5 throughout the 2000s.

Engine Variants

M57D25

The BMW M57D25 is a 2.5-liter (2497 cc) inline-six turbo-diesel engine known for its smooth power delivery, efficiency, and reliability. Built with a cast-iron block and an aluminum 24-valve DOHC head, it uses common-rail direct injection and a single turbocharger to deliver strong low-end torque and refined performance. With an 84 mm bore and 75 mm stroke and a compression ratio of around 17:1, the engine typically produces 163 hp and about 350 Nm of torque depending on the model and tuning. Used in popular BMW models like the E39 525d and E46 325d, the M57D25 is appreciated for its durability, fuel efficiency, and upgrade potential within the M57 family.

M57D30

The M57D30 is a 3.0-liter (2926 cc) inline-six turbo-diesel engine renowned for its durability, smooth performance, and tuning potential. It features a cast-iron block with an aluminum DOHC 24-valve head and common-rail direct injection, delivering strong torque and fuel efficiency. With an 84 mm × 88 mm bore-and-stroke layout and a compression ratio of around 17:1, the engine typically produces 184–193 hp and 390–410 Nm of torque depending on the variant. Designed for reliability and long service life, it became one of the BMW’s most successful diesel engines, powering models like the E39 530d, E46 330d, E38 730d, and the X5 E53 3.0d, and is widely appreciated for its robustness and excellent tuning headroom.

M57TU2

The BMW M57TU2 or M57D30TU2 is the final and most advanced evolution of BMW’s 3.0-liter inline-six common-rail turbo-diesel engine, featuring an aluminum block with cast-iron liners, a 16-valve DOHC head, third-generation Bosch common-rail injection operating up to 1,600-1,800 bar, and a variable-geometry turbocharger. It uses an electronically controlled swirl-flap intake manifold, EGR system, air-to-water intercooling, and a diesel particulate filter, delivering smooth torque, strong fuel efficiency, and improved emissions, offering better drivability and performance. 

Frequently Asked Questions