I got the results back from my Schaeffer's Oil UOA and based on those results I am pretty pleased with Schaeffer's Oil. I will have to see what other people say about the results. If everybody agrees that Schaeffer's Oil produces good results I think I will stay with Schaeffer's Oil. I am going to have to make a decision as to which Schaeffer's Oil I use, however. Since I like 3000 mile oil changes I was considering using the MicronMoly; and Bob got very good results with the MicronMoly. I put only about 2600 miles on that Schaeffer's Oil but they were hard miles-a dust storm, 12 hour trips, desert heat, mountain roads, etc. Most of the miles were put on during my vacation to Arizona. Based on the results of that UOA I think I can put on 3000-4000 miles per oil change. There was a post here recently about Chevron 5W-40 synthetic oil being sold at AutoZone Stores. I happened to go to a AutoZone Store and I was told that, at least for the store in Pueblo, they do not stock Chevron oil. Another thing I think I will do is get a VOA on Mystik oil. I always wanted to find out if it was really as good as some said.