Transmision Apocolypse !!!!! Or is it ........

09 taco 2.7 auto 4speed 78k ; til today ive been using conventional auto tran type I-IV I picked up 4 quarts of valvoline same type but full syn. Big mistake on my part i wasnt paying attention and did not notice till i dumped the first qt in the pan. store was closed by then and i need a ride tomorow so dumped the other 3 qts. Test drove it 8 miles no probs. My question is; is this the end of my trany or can the mentioned fluids be mixed if so ill continue to replace with full syn wich i change out every 12 months regardless of mileage.

 

Your fine. If your worried about it, just replace the fluid.