Synthetic oil will last longer between changes. If you change at the same interval you were with dino oil, you'll be experiencing less friction in your engine and should have improved engine life. If your engine is consuming oil, it might get a bit worse with synthetic.
If you have a car where synthetic isn't required by the manufacturer, you'll be fine running dino oil if you use good filters and shorten the interval a bit. It basically boils down to how lazy you are, and how often you'd like to change your oil.
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