8. Oldsmobile Diesel
In the late ’70s, American manufacturers were all about fuel efficiency and downsizing. The era of big cruisers and powerful gasoline engines of the ’60s was gone. Everybody was trying to introduce new, innovative technologies. Oldsmobile was at the forefront of this new trend with the introduction of the diesel engine in passenger cars. The company introduced the 4.3-liter V8 diesel engine as an option for the Cutlass line. Soon afterward, this model was subject to enormous amounts of recalls and engine swaps.
Unfortunately, the 4.3-liter had the tendency to explode and shatter during normal driving. Passengers weren’t hurt, but the car was unusable. Oldsmobile later introduced the 5.7-liter diesel that was somewhat more durable. But most people consider the 4.3-liter the worst diesel engine in history.