All right, gentlemen. I bit the bullet and plunked down $40 at WM for a jug of Mobil 1 AP for my 2013 Tacoma 4.0L V6. It's time for this experiment. I've run Castrol Edge EP for the last 11 months (13,000 miles) and will send a sample off to Blackstone Labs for analysis when I drain it very soon. Will post results to see if the Toyota V6 accepts longer OCI very well. Anyone else running the Mobil 1 AP now?