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Never Buy These Cars Used

Unless you really love hanging around at your local mechanic’s, we consider staying away from these 10 used cars.

If the Internet has helped make us car enthusiasts better informed of anything, it’s hearing from owners of cars that interest us and learning from them all the little things that go wrong with a car over the course of ownership. This helps us know what to look for when we shop for a car in any category, what the maintenance requirements are, and which models to just flat-out avoid.

This list will cover 10 used cars to absolutely avoid, lest you consider yourself an expert mechanic for that particular model or you really love hanging out at your local mechanics’ shop.

Some of these cars are otherwise great but plagued by a catastrophic failure point while others will be death by a thousand cuts, incessantly throwing up little issues until you’ve spent all your money and patience trying to keep them on the road.

Next time you’re shopping used cars, avoid these 10 models.


Audi C5 A6/Allroad

The C5-generation Audi A6 (1997-2004), particularly in Allroad form, has an almost comically bad reputation. For starters, any work that needs to be done the engine, including replacing blown turbos (a common issue on the 2.7l V6) and replacing the timing belt every 100,000 miles, requires the removal of the entire front of the car.

“Tiptronic” automatic-equipped cars have a 100% transmission failure rate, requiring an expensive rebuild or replacement. Add fragile air suspension and dicey electronics to the mix, and the Allroad is a wagon that’s not worth the fight it puts up.


2007 Mercedes-Benz S550

Not all used S550s of this generation are to be avoided, but the 2007 model year has a fatal flaw. In an article for Jalopnik, Tyler Hoover, a man with some experience owning dicey German luxury cars, explains that the 2007 model year of the S550 is the one year to avoid due to an issue it has with one of the V8 engine’s timing chain gears. It was made of poor quality materials and tends to fail without warning, and it can do terminal damage to the engine. The repair requires an engine-out teardown, if the engine can even be salvaged. The solution? Buy a 2008 or newer model, as they don’t have the same flaw.


Any 1990s Cadillac With A Northstar V8

Old GM vehicles generally make great used car bargains. Most of them are reliable, cheap to repair, comfortable and practical (if a little boring). But GM is not without its faults and neither was Cadillac’s early-90s flagship aluminum block, 4.6l, 32-valve V8 it called “Northstar.”

The unit was used in tons of cars through the decade, including the 1993 Allante, the STS, the Deville, and the El Dorado. The engine’s flaw has to do with the cylinder head bolts backing themselves out of the softer aluminum engine block, causing blown head gaskets, oil leaks and other issues that can lead to serious and irreparable damage to the block.


Volkswagen Touareg V10 TDI

Needless complexity and difficulty of repair plague most used German cars but few more so than the first-generation VW Touareg SUVs fitted with the TDI V10 diesel engine, sold from 2004 to 2006. It was an extremely complex powertrain, certainly more complicated than gasoline-powered Touaregs. It has electronic air suspension and complex ECUs to run everything, both of which tend to fail. It’s also known for devouring its turbos, for interior electronics to fail and other build quality concerns with VWs of the era.

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