After their attempts to make their own diesel engines sputtered, GM decided they would buy engines from someone else. They hired engine maker Detroit to build the next diesel engine and ended up with an uneconomical and weak 6.2 L engine. Despite being at a big size, the engine produced a shockingly small amount of power, a mere 130 HP.
That’s only about forty more than your average Smart car. What’s worse, the 6.2 also had a bad oil leak problem. It kept oil costs high, and repairing the break meant removing the entire transmission.
The 2008 Nissan Frontier Had Extra Costs
The oft-maligned Nissan Frontier makes a few appearances on this list, but the 2008 model year might be the worst one of the bunch. The radiator issues of the 2005 Frontier were bad, and the myriad issues that the 2006 model year presented were worse, but there are few car problems more aggravating than transmission issues.
The 2008 Frontier had a terrible transmission that required extensive and expensive work if it cropped up – and it cropped up for a lot of people. For most, the idea of paying both for an expensive truck and for the transmission problems was too much. Nissan wasn't able to work out the problems, and the car tanked.
The 2020 Ford F-250 Gets it Wrong Everywhere
According to Consumer Reports, the Ford F-250 is the worst pickup of the 2020 model year. Ouch. Of the eight full-size trucks that CR tested, it had the lowest ratings across the board, even though it was still rated well for its towing capabilities.
The 2020 Ford F-250 got a mere 15 miles per gallon, a shockingly low number, but the thing is, they aren't really used for traveling long distances – they're for towing and hauling. Still, you'll end up paying more for repairs, you'll have a cramped interior, and paying that much for gas is enough to give anyone pause.
The Chevy and GMC C/K 6.5 L Was a Mechanical Failure
After the 6.2 L engine faded away like a bad joke, Chevy and GMC developed a new engine with the help of craftsmen Detroit, the 6.5 L. However, it still suffered in multiple areas, including indirect injection and poor output, averaging only 180 HP.
Compared to the Powerstroke Ford engines from the same time, it was outclassed. There were mechanical problems, too: the pump-mounted driver was a common failure point, which caused starting issues, stalling while driving, and more. Truck drivers learned to stay away and buy elsewhere.
The Ford Super Duty 6.0 L is the Worst Modern Diesel Engine
The engine in the Ford Super Duty 6.0 L was so bad it resulted in a legal battle between Navistar (Powerstroke's parent company) and Ford. The issues are numerous and heavy, including a head gasket problem and an absolute disaster of a fuel system rife with failures and leaks.
The worst part is to get at these problems; it was common to have to remove the entire cab of the truck, meaning repairs took forever and cost a wad. With those kinds of issues waiting to drop, would you pick this truck up? Not likely.