2008 5.3 flex fuel afm 197,500 miles.
I can only get maybe 1,500 miles on an oil change before check engine light comes on for low oil pressure detected. Changed sensor the first time I got the code, screen was clean but replaced anyway. Also changed oil at the same time. Has always used Oil, have to add a quart every 1500 also. It appears I have a leak where the oil pan attaches. Have been using Valvoline high mileage synthetic mix since 100k. With fresh oil change 30 psi at idle, 40+ at highway speeds. As oil gets old drops to less than 20 cold, and 20 at warm idle, 30 or less at 60 mph. Any ideas?