This is my 3rd sample for this truck from Blackstone labs. 39,451mi on truck and 5,275mi on Shell Rotella T4 15w40. UOA came back really nice, although my Regen cycles increased in frequency using this particular oil. That I did not care for. I switched to T6 5w40 and have already noticed more distance between Regens along with a more stable/consistent/predictable soot reading when all things stayed pretty consistent (fuel refill station, driving habits, temperature, etc).
Last edited by M56959; 08/20/19 07:54 AM.