I've only changed my oil once so far and used just normal Dino, but will probably switch to synthetic once I'm through the first couple of changes.
But, to the synthetic thing. We have been told for so long to change oil at 3K, everyone believes it. That may have been true in the 70's but not any more.
My wife has a VW passat. VW specifies 5K changes with either Dino or synthetic. However, the same exact engine is Europe is speced at 10K with full synthetic only.
I've always used Mobil 1 in that engine because it's a turbo and has a 180 degree normal operating temp.
I changed at 5K just for warranty reasons, but now that I'm out of warranty, I go 10K. No problems yet, but of course, you won't know until it's too late.
This engine actually had an oil cooler failure about 3 years ago and lost oil. My wife was smart enough to shut it down when the light came on, but the oil was very low at that point. I believe having the Mobil 1 made a difference, but again, you'll never really know.