[overboostTSI]

About 7 years ago the transmission on my 300e was slipping usually after I would get off the highway. So I took a chance (had nothing to lose) and changed the fluid in the torque converter and trans. Car was running fine til about 2 years ago when I started having problems again. This time I changed the filter and fluid. Car is still driving on the same transmission. I used regular off the shelf Dexron as a matter of fact I recall using Murray's crap and the car runs fine. The 300e is not a racecar! You don't need to waste money on special fluids! Try changing your fluid, if your tranny is going out anyway then you have nothing to lose.