Went to the dealership and they were trying to tell me that GL5 was better for my traney even though I had a gl4 one. I told them thanks and did not buy anything for the traney yet. I know they have the coastal stuff at autzone so I am going to pick that up on my way home from work today. I have a feeling that the people that owned this car before me did not do the best job on fluid changes so I am going to use the coastal and then change it to a better synthetic in about 10k miles to get the rest of the gunk out.