I'm rapidly approaching an early scheduled ATF flush and filter change in the Saturn and am in the process of considering several fluids.
I'm doing the ATF change early this time (20K) as I'm going to replace the OEM spin-on filter that was overlooked at the last ATF service. Thus, the filter has been on for the last 55K/5yrs.
I have a leak coming from the transmission, and the leak appears to be from the top cover gasket area. I'm going to replace the filter first to see if it corrects the problem.
In relation to this topic, I had originally considered the Mobil 1 ATF for $5.99/qt, but I can purchase Supertech Dexron-IIIH/Mercon for a $5.88/gal. Just can't justify the price difference for normal driving.
My $0.02