I was watching Horsepower TV this past weekend and they did a segment "if you change fluids, will it gain HP?" The theroy behind it was "less resistance=more HP". They took a 99' Camaro SS and dyno'd at 300 HP. They switched the trans, diff, and oil and re-dyno'd at 308 HP. All synthetic fluids were used for the least amount of friction. Figured I'd pass it on.