Yes I know that foolish.
On FTE we was on. Alot diesel mechanic and SERIOUS owner who strict maintain. Did test on that theory and had UOA on 2 oil. 1 from Hpop and 1 oil pan. They say it wasn't WORTH effort.
It show that it FALSE. It change oil so fast. You couldn't get old oil out head that like it hold 2 quarts something.
Problem is Previous owner ran out of fuel many times that what killing injectors. Change oil once a year
He say once he refill tank when low fuel light coming ON.
I will investigation on this F350 to find why it consume fuel too much at idle.