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General Motors

When you make as many cars as GM, you're bound to make some clunkers, as this ever-growing collection shows. Hoping to improve its image, GM has extended the warranty on its 2007 models.

Like other manufacturers, GM is often reluctant to publicly admit problems. Instead, it describes such things as banging engines in brand-new trucks as "perfectly normal," while secretly buying back vehicles from consumers who are assertive to retain a lawyer. It's been playing this little game lately with its full-sized pickups and SUVs.

Then there's DexCool, the standard coolant on many new GM vehicles. The owner's manual states that this stuff lasts up to 100,000 miles. In fact, in all too many cases, the coolant turns to gunk long before then, causing serious problems that include overheating and subsequent engine failure. GM knows about the problem but so far has refused to take responsibility.

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