I put two 1-ounce bottles into my 2000ES and the difference is noticable. I spoke to a friend who is a mechanic at the local dodge dealer, he explained that the Ram truck owners have been doing this for years and no one ever has a problem. His further reasoning was that if it was bad for your car Mopar would restrict the sales of the stuff.
The mopar part # is 4549637, $3.05/ea, and you will need two of them. Simply take out yout trans fluid tube and put the stuff in. It takes a few days to work but you will like it!!!