The BMW S50 is a high-performance inline-four engine produced by BMW for their sports cars, particularly the BMW M3 models in the early 1990s. Known for its robust design, the S50 engine features a DOHC configuration and a displacement of 3.0 to 3.2 liters, delivering impressive power and torque. This engine is celebrated for its smooth operation and high-revving capabilities, making it a favorite among car enthusiasts. The S50 was part of the BMW M division's efforts to create a lightweight, agile sports car, contributing to the iconic status of the M3 in automotive history.