Hello all, I need to change the transmission fluid in my 5 speed manual Cabrio. I am planning on using Mobil 1 synthetic. Does anyone know how much I need to buy? I am hoping this takes care of a problem that started a couple of days ago, once the fluid in the transmission is warmed up I can't shift into 5th gear. It's like hitting a wall with the shifter. When it's cold it shifts fine. I was told that the fluid is thicker and higher in the pan when it's cold and then as it warms up the fluid level is low enough that the highest gear(5th) won't work. Thanks for any help and information.