I have a 2016 Trailhawk. I have around 4000 miles on it at this point and see i'm almost down to the add mark. Does anyone know what oil is used from the factory and after that what is generally used. Is is semi syn....full syn or just regular oil? I might just have it changed since its almost down to the add mark instead of adding. I guess i'm from the old school of changing it sooner than needed!