Location. Bolivia. Aug 22, 2002. #4. Big advantage is in the VI. A good Dexron will have 190 VI, and a Hydraulic around 100, so the Dexron works like an ISO 32 at 40C and an ISO 68 or better at 100 C. Better pumping at low temps, less seal and hose breaking. Better pressures in hot weather with less leakage. More @Wikipedia
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