Last fall I tried this additive Cataclean on my 1996 Ford Taurus as it was running and idling very rough with hesitations as I had already done a host of other work plus higher octane fuels to try and solve the issue. This product in my opinion did make a difference after just one use all the issues just seemed to vanish and the car has run better than it has in 2 years. I have added this product to our other cars in the household and I seem to have notice they all seem to run smoother. This product is high as it was $20 when I bought it in the fall and I just paid $26 basically for my recent purchase. I also have added Ceretec to my Impala when I changed the oil just two weeks ago. Just wanted to post this and see if other have used Cataclean .