Yeah your right Pokey , but no one is going to put 200,000 + miles on one of these to really make a difference.
Back in 1977 I bought a new Ford van with a 300 six and used Mobile 1 changed oil every 15,000 miles for 300,000 miles , my motor head friend ( repair shop) who did not believe in Synthetic oil removed the head and said , that **** WORKS , hardly any lip at the top of the cylinder, that motor also idled for a couple thousand hours .