What was the most expensive car ever sold at auction

Context: On May 5, 2022, in a secret auction at the brand's museum in Germany, Mercedes-Benz sold one of just two 1955 300 SLR Uhlenhaut coupes from its extensive collection of historical automobiles—which dates back to the earliest days of the car in the late 19th century. The sale, to a private buyer, was for 135 million euros. It handily outstripped the previous record-setting $48.4-million sale of a 1962 Ferrari 250 GTO at a 2018 auction to become the most expensive car ever sold at auction. Both of these high-dollar sales were brokered by RM Sotheby's.

Answer: A 1955 Mercedes-Benz 300 SLR was reportedly sold in a secret auction for 135 Million Euros