The 4.0L engine, marked by the 7th digit VIN 2 and without secondary AIR injection, is a strong choice for those seeking a reliable used engine with a focus on emissions compliance. This naturally aspirated V6 engine delivers balanced performance supported by an electronic fuel injection system for consistent fuel management. Its DOHC layout enhances operational reliability and smoothness, making it suitable for drivers needing a dependable and environmentally responsible used engine for daily use.