After two years of VOA',/UOA's, anecdotal experiences, etc. posted here, has anyone here kept track of all the data enough to dare an attempt at ranking the OTC dino oils of popular grades (5w20,5w30,10w30) and list the "top" three in overall quality (long engine life). Let's attempt, somehow, to "average" all of the variables such as engine make and age, driving style,OCI, climate, etc.. I know, this is impossible. What are the top three oils in each grade and why? Are there some oils that are clearly not as good - you guys seem to play down Valvoline. When it gets down to picking between two brands, say Chevron and Pennzoil, is there a clear winner? Thanks for attempting the impossible. I did a search and formed some opinions. I would like to hear yours.