This is a two-part series of articles that ran in the Saturday Evening Post in 1925. They are an autobiographical overview Oldfield wrote with the assistance of William Sturm. I judge some of this material to be inaccurate, not because Oldfield embellished (not that I put it past him), but because I think he simply forgot things.
I believe this video is a highlight reel from the 1920 Indianapolis 500. Note Bennett Hill spinning and hitting the inside wall at either turn two or four in Frontenac #7. This is significant because his teammate Gaston Chevrolet later won the race in a sister car.