My wife has a 2003 Honda Accord with 75K miles on it and have run amsoil ATF since about 30 K with an auto rx treatment and subsequent flush at 60 K. I will most likely wait for Specialty Formulations to reopen to buy their Z-1 fluid, but wondered what other synthetic options are out there? Redline ATF D-4 looks similar to the previous amsoil ATF specifications. Are their other possibilities as well? The amsoil is doing an excellent job, but I like to keep possibilities open...in the world of oil and transmission fluids.