I have a 1989 Honda Accord SE-i with an Automatic Transmission. The last time I changed the fluid I replaced all of it with Honda ATF-Z1, but the transmission still shifts hard. It has 202,000 miles on it and have been trying to decide between Valvoline's Maxlife Dex/Merc and Amsoil's Universal Transmission Fluid. While I do believe Amsoil's is the best fluid in general, I keep getting drawn back to the high-mileage factor (plus the cheaper price) with Maxlife. I've been reading all the technical information I can find on both Valvoline's and Amsoil's sites and I just can't decide, does anyone have any input for me that might break this mental stalemate and allow me to make a decision?