FILE - In this May 29, 1994, file photo, Al Unser Jr., driving his Penske-Mercedes (31), leads teammate Emerson Fittipaldi (2) into the first turn at the start of the 78th running of the Indianapolis 500 auto race in Indianapolis, Ind. In 1994, Penske’s team couldn’t be touched. He came to Indianapolis with a roughly 1,000 horsepower engine built by Mercedes for only one race -- Indianapolis. (AP Photo/File)