Valvoline has a Motor Oil Myths page on their website:
http://www.valvoline.com/car-care/motor-oil-myths/
I was surprised by their answer to the differences between Dino and Synthetic basestocks:
MYTH: There is not any real difference between conventional and synthetic motor oil.
REALITY: There are not any real differences in the basestocks used to make synthetic and conventional oils, but there are differences in the additives and process used to make the final products.
http://www.valvoline.com/car-care/motor-oil-myths/
I was surprised by their answer to the differences between Dino and Synthetic basestocks:
MYTH: There is not any real difference between conventional and synthetic motor oil.
REALITY: There are not any real differences in the basestocks used to make synthetic and conventional oils, but there are differences in the additives and process used to make the final products.