The 4.0L engine identified by the 5th digit VIN K is a durable used engine with a naturally aspirated design that delivers consistent power without forced induction. The electronic fuel injection system allows for precise fuel distribution, enhancing both performance and fuel efficiency. With a V6 layout for balanced operation and a single overhead cam (SOHC) design for simplified maintenance, this engine is ideal for those looking for a straightforward, reliable used engine to power their vehicle with minimal upkeep.