What do ya'll think of the Amsoil Manual Transaxle and Transmission oil (75W-90)? I am getting ready here in the next week or so to fill my NV4500 5-spd with it, along with installing Fast Coolers, so it'll take about 6-6.5 quarts to fill. If it works as well as all the other Amsoil poducts I've run, I'm assuming this will work well too. I just can't see spending $150 bucks at the dealership for 7 quarts of Castrol Syntorq!