Main Bearing Set +0.25mm Infiniti QX30 Q50 Q60 2.0L Turbo M274 12247HG01A

Engine main bearing wear in the Mercedes-sourced M274 engine is commonly caused by high thermal loads or oil film breakdown, resulting in scoring on the crankshaft journals. When a crankshaft requires professional machining to remove these imperfections, standard-sized bearings can no longer maintain the correct oil clearance. This +0.25mm (+0.010in) oversized main bearing set is specifically engineered to compensate for a ground crankshaft, restoring factory-spec oil pressure and bottom-end stability. These bearings are manufactured with high-strength multi-layer materials to provide superior fatigue resistance, ensuring a reliable engine rebuild and protecting the crankshaft from future damage or engine seizure.