20: Chevrolet Lumina
Another car that sold millions of examples was the lowly, generic Lumina. When you think of a generic car. the Lumina is one of the first vehicles that come to mind. The no-frills design was the focal point of GM in the 1990s, as the company focused more on SUV models during this period.
The Lumina was the quintessential rental car of the 1990s (via Jalopnik), with millions of them being sold and resold at auctions. However, the bland design allowed Toyota and Honda to dominate the market and take a fair amount of market share from GM that they never regained in the segment.