I purchased the Lucas Transmission Fix at the recommendation of a co-worker who has used it on several vehicles. The transmission in my Jimmy had been slipping and I knew we could not afford to get transmission repairs done at this time. I purchased a bottle of the transmission fix and put it in and the results were noticed immediately. I am happy to say that the transmission has not slipped once since we used the product and that has been probably close to 3000 miles ago and still going strong.