I'm getting ready to do a pan drop and filter change on my Trailblazer, and I had thought about doing the same on the woman's Corrolla S. It has 148K on the odometer, and I know it's never seen a fresh filter or fluid. So tonight I was looking at her OM, and it states that the ATF is a life time fluid and under normal conditions it should never need changing. She would prefer to follow the OM, but I'm a firm believer in fresh fluids after a certain point in time. The tranny still shifts buttery smooth, but a fluid with 148K miles on it just doesn't sit right with me. The car is almost paid off and we are gonna keep it for as long as we can. Does Toyota really use an ATF that never needs changing?