I don’t know why my messages sometimes take so long to appear. Anyway, it looks like any decent synthetic is oil for other of these engines if you want to go the extra step in protecting the engines. I currently have just shy of 300,000 miles on the Ford and it doesn’t use a drop of oil between changes. I am sure the body is likely to rust away before anything serious goes wrong with these engines so this is likely overkill as others have suggested.