Because contaminates can lead to acids forming, Yes, you should change it annually..
For me, if it's not anywhere near the hours, or miles I usually change it at, I don't change oil by the calendar.
But, I also use a good quality oil. And oil quality is very good today, so I expect a lot from it.
For me, if it's not anywhere near the hours, or miles I usually change it at, I don't change oil by the calendar.
But, I also use a good quality oil. And oil quality is very good today, so I expect a lot from it.