I will change to Mobil 1 and as I live in the Phoenix AZ area the book says due to the sand to change the oil more frequently.
Good move - I have used Mobil 1 for forty years - I had extensive discussions with the engineers who developed and patented the stuff in the '70's as to the advantages and the reasons for its development.
And, I'm not about to preach its advantages to others. I learned a long time ago that people value most that which they learn for themselves after expending a little effort. In other other words, free advice is mostly a waste of time.
Nitrogen in the tires? All for it - I keep mine inflated to at least an 80% nitrogen level.