4: 1978 Oldsmobile Omega Coupe
The Oldsmobile brand was once a major part of the automotive industry, but nowadays it’s just a relic. However, there were some sports cars that the brand released that have become forgotten. The 1978 Oldsmobile Omega Coupe is one of these cars released during the rising fuel prices of the 1970s (via Hagerty).

The Omega was not popular by any stretch of the imagination, and nowadays the car is worth avoiding. This was just one of the many cars that GM built on this same platform.