one of my family cars (FD) used to be on only mineral because my folks took the cheapest alternative. when it got to my hand, i was on Castrol FS 5w-40 for 3 intervals before i switched to the current SS 10w-40, twice now already. the difference in the engine's "lightness" is significant, most likely due to the different viscosity. that apart, to me they drain the same cos i keep the oil change frequent:
Mineral - 4000KM
Semi - 7000KM
Fully - 9000KM
You mean the difference is felt between all 3 types of oil or just from mineral to FS?