The 4.0L 1GRFE engine, linked to the 5th digit VIN U and produced through September 2010, is a reliable used engine choice for vehicles in this model range. With a naturally aspirated design, it offers steady power without the need for turbocharging. The electronic multi-port fuel injection system ensures efficient fuel management, while the V6 layout and DOHC design provide balanced performance. This engine is ideal for older models, offering durability and efficiency for drivers needing a dependable used engine solution.