Prior to 2000, about 80 percent of the automatic transmission fluid (ATF) market was covered by General Motors’ Dexron III, Ford’s Mercon or Chrysler’s ATF +4 standards and specifications. It was easy for an installer, mechanic or do-it-yourselfer to figure out which one to use for makeup or replacement fluid. Lubricant marketers only had to carry a couple of aftermarket fluids to meet a majority of the demands. Today, Dexron III/Mercon fluids are gone, replaced by Dexron VI and Mercon LV. In addition, they account for less than 50 percent of the aftermarket use. OEM-specific fluids with special requirements
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