World's Most Expensive Lemon.

Mark Johnston, the co-owner of Grand Prix Motors, is suing car maker Mercedes-Benz for selling him a $1.7 million dud, a Mercedes AMG CLK-GTR roadster, which only 6 were ever made. This is quite probably the world's most expensive lemon to date:

It was a sweet ride turned sour: a $1.7-million Mercedes-Benz roadster that died after cruising 10 blocks. That works out to $170,000 a block — perhaps the most expensive test drive on record:

"It's the mother of all lemons," said Mark Johnston, co-owner of Grand Prix Motors. Nearby, in the small Mar Vista showroom, rested his handmade Mercedes AMG CLK-GTR roadster.

Designed to safely travel at nearly 200 miles per hour, the 12-cylinder, 612-horsepower beast was out for its first spin with a prospective buyer in 2004 when the oil light came on, the gears wouldn't shift properly and the car shuddered so violently that the windows came unglued, Johnston said.

LA Times Article - via Autoblog