Nope. 석유 is included in 기름. 기름 means oil in the broad sense(like all of greasy things) And gasoline is a part of 석유 석유 = petroleum --> It means the whole things that were refined from crude oil. 원유 = Crude oil (석유 includes 휘발유, 등유, 경유, ......and so on) 휘발유= gasoline 등유=Kerosene 경유 = Diesel Oil