Would be an interesting test to do is see what oils hold what specifications and then run them in real world intervals and every thousand miles test them and see if they fallen out of specification. We see a lot of people going off TBN as the way to explain how well an oil is holding off to acidity, but what if an oil has a better structure and doesn't need to have as high of a starting TBN. I myself would like to see the 5w-30s in a test to see how long they can actually stay in grade. If they fall out a grade then I can presume that they are out of specification at that time. As long as cost is still the primary thing that both the consumer looks at and the company who creates the product looks at then it's possible that you're never really going to get a great product that's going to last or hold up. I'm starting to see why people are using the oils of high performance lubricants, amsoil, redline oil and a few others. It just simply goes back to you get what you pay for.