My local Honda dealer charges $4.50 a quart for Z-1. That does not seem unreasonably high to me. Consider that Mobil 1 costs $6, Amsoil $9-$10 and many synthetic blend fluids are right there in that $4 range I don't consider Z-1 overpriced. A drain/fill requires 3 quarts, about $15 worth of ATF. Z-1 is the correct fluid for these cars, its the safe play.