Genuine OEM Nissan O-Ring Gasket, part number 315263JX9E. This O-ring is specifically designed to create a tight seal within the oil pump assembly. Its function is to prevent oil leaks and maintain the necessary oil pressure for engine lubrication. Manufactured from high-quality, oil-resistant rubber, it ensures durability and reliable performance. Genuine OEM O-rings are critical for maintaining the integrity of the oil system, providing a precise fit and consistent sealing characteristics that aftermarket parts may not match.