Hmmm....very interesting Reza. I've been running regular BG synchroshift for the last 2 years and even though the transaxle shifts better than it ever has I find that when it gets hot it tends to get cranky and I have to granny it until it cools down. I used to use the semi synthetic motomaster blue by itself or mixed with the motomaster full synthetic gold bottle for the longest time. It was fine in the summer but off season shifting became a problem because it was too thick. I was going to go with BG synchro II this coming spring but I think I'll try a mix of regular BG and motomaster blue instead. Even Dave "I'm an honest a**hole" Buschur claimed years ago that his race car had much more tranny breakage when he was using synthetic oil as opposed to dino oil.