i had used MaxLife ATF on my Acura and Subaru, it's not approved by Honda... it's different feel to the OE fluid but in a positive way. i think MaxLife will not destroy the trans. how is the reputation of the AT unit on the car? reason for my question is i can see if warranty work on the trans is needed and none-OE fluid was used , Hyundai will focus on their energy on deny or delay. even if fluid did not cause the damage. i am sure they have vacant spot on the lot to have the car park there for weeks, til issue resolved or not, they may also charge parking fee.