flatlandtacoma, after I discovered Cermax, I don't recommend ANY snake-oil. I will use Cermax. It does everything Auto-Rx, Motorsilk and other good products does. Only better. However, when I see a person here on the board, speculating in if he should risk his engine by using Auto-Rx, then I recommend Auto-Rx. It is better than plain oil. When this person learn that not all additives are snake-oil, he may try another product next time. Up to date, no other products that I have tested, give the results that Cermax do. The second best is Synlube, and Auto-Rx is number 3.