Engine Crankshaft Main Bearing Set +0.25mm BMW 240i 340i 440i 540i X5 X6 B58

Precision-engineered for the BMW B58 and S58 modular engines, these crankshaft main bearings are designed for engines requiring a +0.25mm (+0.010in) oversize due to crankshaft journal machining. In high-performance turbocharged applications, maintaining the integrity of the oil film between the journal and the bearing is vital. This set provides the necessary compensation for material removed during professional grinding, restoring factory-standard oil clearances. Built with premium multi-layer materials to resist fatigue and high thermal loads, these bearings ensure smooth crankshaft rotation and consistent oil pressure, even under the increased stress of high-boost environments.