The BMW N52 engine was introduced in 2004 and quickly ... The two engines feature different aluminum cylinder heads. The N51 also has a reworked crankcase ventilation system, which is the most ...

BMW produced several variations of the M50 with displacements that ranged from 2.0 to 2.5 liters. The DOHC motors had four valves per cylinder, an iron block, and an aluminum head. BMW introduced ...