Main Bearing Set +0.50mm Infiniti QX30 Q50 Q60 2.0L Turbo M274 12247HG01A

Severe engine main bearing wear in the Mercedes-designed M274 engine is often the result of oil starvation or extreme thermal stress, leading to significant scoring on the crankshaft journals. When a crankshaft requires substantial machining to restore its structural integrity, standard or minor oversized bearings are insufficient. This +0.50mm (+0.020in) oversized main bearing set is engineered to provide the precise oil film clearance required for a heavily ground crankshaft, restoring factory-level oil pressure and rotational stability. Manufactured with high-strength multi-layer materials, these bearings ensure the bottom end can handle the torque demands of the Q50, Q60, and QX30 while preventing future metal-to-metal contact and catastrophic failure.