Surprise Surprise to all the afficiondos of expensive oil. I changed my fluid when I did the clutch job and refilled with Gulf 10w30 bulk oil right out of the tap. I was amazed at how much easier it was to change gears with fresh oil. Not knocking the expensive oils, but it would seem to me that most of the improvement you feel after changing the transmission oil is due to it being full of nice clean fresh oil, not from any kind of superpremium oil.