Re: Question about transmission fluid
You won't have any problems running 100% synthetic oil in the transmission. Ford sells and advertises what they think works BEST in their vehicles. Of course they'll market their own product wherever and however they can. I run Amsoil ATF in my '99 Taurus which calls for Mercon IV/V. At the time, Mercon was a semi-synthetic and the dealer just charges too much for Mercon V. Amsoil also backs their products with their own warranty. I've been a higher volume Amsoil dealer for nearly a decade and haven't heard of any component failures.
'00 Durango R/T 360ci 290hp (modded); 138,500m
'06 Pontiac G6 GT 3.5L 220hp; 44,000m
'12 Chrysler 200 Limited 3.6L 283hp; 13,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!