Originally Posted By: FoxS
Mercon V will be compatible but different ATF should not be mixed.
That's why I recommend a complete exchange.
MC had a great VI, better than Citgo and way better than Amsoil.
However, Amsoil has significant additional heat protection and is rated for 100k service / 50k severe. That's over 3 times what Ford say. So you could conceivably do one full exchange and forget about it for a long time.
So your saying as long as I stick with a mercon v, I should be alright regardless of brand? And not to mix mercon v with other ATFs.