The Iron Duke was a very sturdy engine, just that they were rather underpowered for a sports car type application. The only knocks on the Iron Duke was they sometimes leaked oil and were really noisy. When they were in their heyday in the mid 80s, the Iron Duke was a REALLY noisy engine. By 1990, the Iron Duke became for less noisy. As long as you changed the oil in the Iron Duke, it would run until the body crumbled around it.