AISIN is the No. 1 supplier of oil pumps in the world. All AISIN Oil Pumps are engineered in conjunction with automobile makers during the initial stages of new model vehicle development, years before they enter the market. Using the exact process of development and utilizing the same OE manufacturing plants for production, AISIN Aftermarket Oil Pumps exhibit the same quality, durability, performance, and reliability to that of the OE product.