We have to say we have tested many lubricants in our 27-year history, but have never been so impressed with the performance data and open-minded approach to improving lubricants as demonstrated by our company Midco Lubricants, Rockford, IL. Our newest Midco Diesel Maxx 15W40 says it all. We found that it not only meets but also exceeds any of the over 50 engine manufacturers specifications that we have compared and stored in our data files from 2007 to date. We were particularly impressed by the extreme heat and durability test in the southern California Baja test. Out of 140 entries Midco’ Maxx 15W40 performed in the top 5 with the measured difference of those top 5 being less than .0227%. Midco’s Mannich Technology, part of their PolyX program, is an obvious winner. We expect more good things to come out of Rockford in the future.