Many of our increasingly complex energy concerns can be solved with diesel engines. They have minimal downsides and are more efficient than standard engines. A diesel engine with poor design, however, might potentially be a significant issue. The diesel engine of the 1979 Oldsmobile Cutlass Supreme Diesel caused a lot of performance issues. The engine had issues with fuel consumption and was, at best, unreliable. The highly subpar performance of the diesel engines in the Cutlass Supreme is often credited by analysts as being the cause of the decline of the American diesel engine market. The engine blocks are one advantage of the Oldsmobile Cutlass Supreme. Race car drivers still use them now since they were manufactured so beautifully and sturdily.