Synthetic is the greatest thing for cars since rubber tires!
Notice Toyota uses synthetics and have been reccomending oil changes @ 7500 miles for more than a decade now.
If you really want to know about oils, don't ask here. People are too opinionated and don't know anything. If you want to know more about oil visit
Bob is the oil guy's forum and ask. They'll tell you straight up about oil.
My personal fav is the AMSoil test going on because several AMERICAN cars are over 50,000 miles with only fiter changes & top-off's from normal oil use. (That includes oil analysis to ensure good oil & nice engine wear)