One of my trucks is 1800 miles away with my son. 2007 F150 with 64k miles. I installed a B&M trans pan plug so we can quickly swap out 4 quarts therein as part of fluids half-life maintenence. All 12 quarts in there are Motorcraft Mercon V. My son will take this to Midas and they'll swap in 4 quarts of Valvoline Mercon V. Do my Buick brethren think I should be at all concerned for the two different brands of ATF in the same automatic transmission? Gracias guys!