I have customers that run all kinds of fluid. And I seen no difference in bushing or clutch wear. The fluids range from reg. Type F, to synthtic, to hyrda-stat fluid. I personally run Napa type F. I have never felt the need to spend the money for the higher priced fluid, when I see no wear difference. Some one may have other reasons, such as temp as a reason to run a higher cost fluid. I am interested in hearing everyones choice and why, all info is good.