If it would have something to do with the oil i am using than i would suspect the other lobes to have the same amount of wear.
I am using 15w40 and when hot i get a oilpressure of 25-30 at idle.
As i said ther are 3 lobes with wear sign and the 2nd exhaust lobe seems to have gind up the lifter wich is a lot shorter now.

Dennis.