To all that are experienceing transmission problems. I have a 91 Celica GTS with 450,000km and I started to experience delayed shifting. I would take off from the light and it would automatically shift from 1st gear right up to 3rd and get stuck. I figured after neglecting to do a tranny service in more than 100,000km that it may be a good idea to do one. I also put in a bottle of Lucas Transmission fix. I honestly can say that I have never felt my transmission shift smoother since i got the car. All shifts are smooth, and not getting stuck. I would highly reccomend this product to anyone. One tip I got from a parts store was to empty half of a 4L jug of tranny fluid and mix the treatment with the fluid first. Makes for easyier pouring. Use this product if you got a problem. Trust me!!!