2014 F250 6.7L PSD, 10,070 miles on Amsoil DEO Signature Series Max Duty 5w-40. 161K on engine. Wix filter.
Sample #s 1, 4 & 5: Amsoil DEO SS 5w-40
Sample #s 2 and 3: Red Line DEO 15w-40
Deleted 1K into #4. Looks like much improved wear numbers, and no fuel dilution, after delete. And oil...