why would people use gas motor oil in a diesel ?
turn that around and there is why diesel oil is best for diesel motors .
unless someone wants to try to keep the soot particles that is not in a gasoline crankcase suspended in a gasoline engine for 30,000 miles like the trucks do with mineral oil which would be sillyness to try .
oil gets dirty and needs to be drained . no need for hi base number in a gasoline motor using mineral oil.