I have been told by Varsity Lincoln, Novi Mi, to completely disregard my owner’s manual on this issue 1. Immediately disregard the manual indicating OIL “Blend” and to a pure synthetic oil change at 4,000 mi, 2. Change coolant every 30,000 in regard to PH levels. Will follow this and DISREGARD MANUAL. The Oil Blend Issue Is The Most Foolish Mistake Lincoln Made. Nearly all cars back then (2018) came off the line with synthetic oil