At one time, their "Friction Proofing" was forced off the market because no one else could match it. I used to use it and would again if I could find it. Pep Boys was the only place I could find it and they stopped carrying it years ago. I use Lucas now, but it's not the same. After a few treatments of Wynns', my engine started easier, ran cooler, and I had to adjust the idle down b/c it climbed from less friction.