A police stop, a free hat, and a letter to GM's boss — here's the story of Warren Buffett's Cadillac upgrade

A police stop, a free hat, and a letter to GM's boss — here's the story of Warren Buffett's Cadillac upgrade

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Trading in a banger for a shiny new car is always exciting. But it's hard to top Warren Buffett, whose upgrade saga involved a frontwoman, a free hat, a $122,000 charity auction, a police stop, and GM CEO Mary Barra.

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