16: Chevrolet Tahoe 6.5L Diesel
The Chevrolet Tahoe has been a massive success for GM over the past three decades. But it was the first generation that introduced us to the comfortable full-size SUV. Before the Tahoe, the big truck-based SUV models were usually two-door and had a removable top. The Tahoe was a quiet and smooth riding SUV that was spacious and everyone with a family wanted one (via 6.5 Turbo Garage).
Less well-known and even regretted by GM was the diesel version of this Tahoe, considered one of the worst cars in GM history. The reliability was abysmal at best, even when the truck was brand-new. Tahoe buyers were generally interested in the gasoline version, but there were a few who opted for diesel. To this day, the diesel is rare and even more difficult to keep on the road.