I have to admit I tried a few oil supplements myself, like Tufoil and Lubegard. But there is at least one oil additive that I believe in, and that is Auto-RX. I will always use 3 oz. every oil change. I also think that a good fuel system cleaner, like Neutra, is needed from time to time. Otherwise, I think a person can go either of two ways (for most vehicles). Either find the best conventional motor oil you can find and change it every 3000 miles, and use the best oil filters you can, or find a very good motor oil and go to extended oil changes, with extremely good quality oil filters. Either way will probably allow you to go a long ways with a car or truck or van or SUV. Other than Auto-RX, you can forget about all of the 'snake oils.'