Okay ..a search had way too many posts with both Amsoil and Delvac 1 in it ...so .... I've had great results over Mobil 1 with Delvac 1 over a approx the same miles. Delvac reduced wear metals by about 30%. My current fill is with Delvac 1 and the only thing that I changed is that I added the Amsoil Bypass filter (running in parallel to the FF). This increased my capacity from about 9.5 quarts to about 10.5 quarts. The two UOAs first w/ Mobil 1 - not the most accurate documentation The second with Delvac 1 Somehow Blackstone didn't get the TBN on the second one. I have submitted an identical sample for further evaluation (TBN). What I'm asking is: If you were to choose an Amsoil product that would do as well as Delvac 1 under the conditions mentioned in the UOA posts, which would it be? Now we don't know if the wear numbers would have come down with just a heavier weight oil since we're comparing x-W-30 to a 5W-40. What I'm really asking is "what would you like to see me try" in an Amsoil (or other for that matter) product given that Delvac has now become my "holy grail"?? Please try and support your choice. Keep in mind that I'm going to keep extending the OCI until I reach any oil's limits. TIA!