I have 2018 Hyundai Elantra 14,000 miles. I went to Valvoline instant oil change. I will only use Valvoline my choice. Usually I go to dealership with Valvoline Synpower. But dealer didn't have opening for 3 days. I was overdue on oil change. But I had to drive to Tallahassee. Death in family. So I went to Valvoline instant oil change. Great service. I will only use Hyundai filter. They let me. BUT on oil told Synpower no longer made. The only Full synthetic they have is Maxlife High mileage. Mgr told me replaced Synpower. I asked its says high mileage. That's for high mileage vehicles. I only have 14,000. Will it hurt my engine. He couldn't answer my question he kept quoting of the screen the benefits of what he put in my vehicles. So I would like to ask you all. Will the high mileage full synthetic with extra stuff in it hurt my engine?