I am over the 60000 mark and was thinking to change the trans fluid to be safe. In the manual it says to use Motorcraft ATF. I have seen in other place on the internet to use mercon. I went to an auto parts store and they said they do not have anything in the computer for trans fluid on this truck. He suggested to go to the dealer. I didn't think it would have been a big deal. Does have a recommendation? Thanks in adavance