Your dad must have gone to school with my dad. Buy a car, two years later trade it in. Oil changes? Pfftt.My dad never believed in changing oil or oil filters. When the oil was low he would add a quart. This was in the 1960’s when engines were not built as well as they are today. He ran the shit out of his cars and put a lot of miles on them. He never had any oil related issues and some of his vehicles had over 100k on them which was rare in the 60’s
Buy any oil that meets the specs and change it when u should. The rest is just BS.
Not a person on this or any other forum has the research to prove any oil is better than another as far as engine longevity is concerned