YOU CAN USE MOBIL 1 SYNTHETIC ATF. IT IS A MULTI-VEHICLE FLUID FORMULA. ALSO YOU CAN USE THE NEW GM DEXRON VI. ALSO OTHER BRANDS OF MULTI-VEHICLE ATF. THEY ALL WORK. I SHOULD KNOW, I'VE USED THEM MANY, MANY, MANY TIMES IN MY TRANNY SHOP. NO PROBLEMS, THEY WORK LIKE A CHARM. BELIEVE ME THAT FLUID SHOULD BE CHANGED MORE OFTEN THAN YOU THINK, AT LEAST EVERY 30,000 MILES. I DO. DON'T FORGET TO CHANGE THE FILTER ALSO.