The BMW B37 is a 1.5-litre (1,496 cc), diesel, straight-three engine with a single, mono-scroll and variable-geometry turbocharger. The compression ratio is 16.5:1. It is the second engine from BMW's modular engine plan, sharing most of its components with the BMW B38 petrol engine. Power output is either 70 or 85 kW (94 or 114 hp).