Just dumped y Mobil 1 10W-30 and changed with the #156. I will be anxious to compare the analysis. Previous was the TriSyn. I would hope the Shaeffers puts up better numbers. Strange though putting in Green oil (#156). I plan on sampling at 5K. Any experiences with the #156?? I would prefer a 10W-40. But with the cooler season-I can deal with it.