 Nyorai kupfuurira kweiyi ndima - DePalma akanga adzingwa nechikwata chemakwikwi cheMercer Automobile Co. mukufarira Barney Oldfield. Mumotokari yeMercedes Gray Ghost, akaratidza kuti aiva nyanzvi yokurwisa pakukunda motokari yaOldfield yaimhanya zvikuru. Akapedza 1914 nokukunda mukwikwidzi wake wechipiri weU.S. National Driving Championship. Gore rakatevera racho, 1915, akatyaira kukunda pa1915 Indianapolis 500nemotokari yeMercedes 4.5 litre GP. 