Running a lpf9750 Luberfiner, wix full flow, Coop Dmo CJ4 15w40 mineral. 6-7,000miles. Air filter has been a large open style, oiled membrane, with pre filter sock. Truck has been deleted since January. Very dusty conditions. Looks ok IMO, air filtration a bit lacking. No TBN numbers avail at the time. Will add that to future UOA. Thoughts?