The gasket features a multilayer steel (MLS) construction

ensuring exceptional strength and thermal stability under high engine loads

2006 - 13     E90 / E91 / E92 / E93     330i

and mechanical reliability

149     31/28

BMW Crankshaft Bolt 11-21-1-720-633 20-0373-FL The gasket features a multilayerBMW part number 11 21 1 720 633 is a crankshaft bolt for BMW M50 M52 S50 S52 and M54 engines. This bolt is used to secure the crankshaft pulley or harmonic balancer to the crankshaft, ensuring proper alignment and rotation of the crankshaft and accessory drive components. When and Why to Replace BMW Part #11 21 1 720 633: 1. Routine Maintenance or Engine Overhaul During a major engine rebuild or overhaul, all critical fasteners should be replaced to