Whatever you do, don't put ATF in the engine I tried Amsoil Universal in my wifes 2007 Elantra and didn't like it. The shifts were too slippery. My mechanic brother-in-law borrowed the car for a day and said be careful, the tranny is about to fail! Drained out the Amsoil and put SP-III back in, shifted quality was back to normal. That was at about 50K miles. When the car got close to 100K miles, and no more warranty, put in ATF+4 and that also shifts great. ATF+4 worked for me. BTW - I always do a complete flush - pop off the AT hose and run about 12 qts. through.
Originally Posted By: 04SE
Mobil 1 Synthetic ATF would work for both your engines.