![]() ![]() Use the wrong viscosity fluid and the transmission control module *may* notice shift inconsistencies at certain temperatures, resulting in altered shift feel/characteristics. Fluid temperature affects the viscosity, and the viscosity affects the pressures needed to complete proper shifts. Anyone want to guess what fluid viscosity that OE computer module programming is based off of? If you guess the OE fluid then you are right (obviously). However, what many fail to realize is the transmission control module has logic coded in the programming that alters shift timing/characteristics based on fluid temperature. Yes, transmissions can operate on a wide range of viscosity, otherwise transmissions wouldn’t operate correctly with cold fluid, or hot fluid because the viscosity is vastly different when cold vs hot. Some people seem to think that “transmissions can operate on a wide range fluid viscosity”, so it doesn’t matter if you use a fluid that’s thicker from the manufacturers approval. The transmission control module uses fluid temperature in its shift calculations. You all realize that contemporary transmissions have fluid temp sensors, right? Viscosity is a VERY important parameter in transmission performance. ![]()
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