Rod bearings are the S54's signature weak point, treated as a preventive wear item owners replace for peace of mind; they cannot be truly inspected without removal, and neglect risks the engine.
S54 rod bearings
BMW E46 M3 (2000-2006) · mechanical
Rod bearings are the S54's signature weak point, treated as a preventive wear item owners replace for peace of mind; they cannot be truly inspected without removal, and neglect risks the engine.