Synthetic or regular oil:
I have been thinking about this since these oils have become available. You can get blurry eyed reading all the information, recommendations and pros and cons available on the net. My conclusions are that unless you are driving your car under what are considered harsh or unusual conditions you can't go wrong following the particular manufacturers recommendations for API class and viscosity. In Hyundai's case they don't call for synthetic oil, but they don't say you can't use it.
Now that I am driving Hyundai's I will try and use regular oil either 5W-20 or 10W-30. From a realistic point of view it is going to depend on where I have the oil changed. I have a trusted independent garage nearby that can provide either type of oil, if I have it changed at a dealership it is probably their call. In my case I am driving so few miles these days that I now just change the oil Winter and Summer without any consideration of mileage.
I think I have been consistent with this approach. When I had the Mercedes Benz I honored their synthetic oil recommendation. After all they "invented the automobile".
There are some interesting posts about oil and changes. I am envious of the folks who change their own oil. I do agree that if possible that is the best way to get the job done. I never did anything but change my own for over fifty years. Unfortunately there comes a time when it is not only hard to get up off the floor, I even have trouble getting down gracefully. There is one other consideration that has bothered me in the last few years and that is finding a responsible and easy way to dispose of the used oil. I don't think throwing it in the trash is a good idea and I don't like the idea of transporting the dirty stuff in a nice new car to a disposal facility even if you can find one.