Synthetic has better wear characteristics. and better lubricating properties than regular dino oil. BTW, synthetic and regular oil all come from the same place, but the synthetic is much more refined and has some more additives than the standard oil. I run synthetic and change my oil every 4k miles, mainly because I do short trips when not towing and I really don`t have a warm up cycle! and I get it for free! my 4k mile oil change interval in the winter is almost 6-7 months (oct-april).
I would just keep running the regular oil and keep up with your normal oil change schedule. KISS.... if it aint broke don`t fix it! LOL