Wife has a 2016 Explorer 3.5L EcoBoost SUV. It has 10k miles on it. We use Amsoil 5W30 or wwhat is recommended. The oil filter is also Amsoil. The oil is changed once a year in the fall. Now we did this with the 2013 same motor SUV with no problems. The question is she may just keep this SUV past the 3 years and is this once a year oil change be detrimental after 3 years? She will be retired and less miles per year will be racked up.