I belive the product works but not well with the LS. I understand where one was comming from thinking that the dealerships should know better but what about the TSB's posted here on the coils and yet some of us had made many trips to that dealer before it was fixed.
I have never got to the bottom of this but I had this done at a dealership once, I had very low milage, now its even worse. I think some cars can handle it but for others with the polish or what ever kinda coating it is, they just cant. I have been questioning this with other mechanics to find out if this is what could be lowering my MPG's even more but like everyones oppinions here I get different confilcting feedback.
Osain is correct, if the cars is well maintained and you dont mix up all kinds of gas and additives its not all that needed. In my case, they suggested it cause of the miles and every dealership wants to push it feeling some customers are at a vulnerable stage do to the rise in gas prices.
