My transmission was leaking, I did not notice it until the car began to shift hard. I got the transmission repaired, but it was too late. Even with new fluid and a new filter, the transmission was shifting very hard. I thought that I was going to have to put in another transmission because it was so bad. A friend recommended LUCAS transmission fix, desperate I added a bottle and the transmission is so much better now it is amazing! Thank you LUCAS for saving me 1500$ in transmission replacement costs!