Question: what is the difference between dexron 3 and dexron 6?
Answer: Quote: Assuming it'll run fine on Dex III, keep in mind that the main difference between the two fluids is that the useful life of Dex III is half that of Dex VI. Actually, the biggest difference between Dex III and Dex VI is the viscosity. Dex VI is a much thinner ATF.