Maximizing the production of petrochemicals from crude oil atthe expense of fuels is among the most important targets forrefiners. In this conversion, catalyst composition and formula-tion play a key role. Here we present a thorough study of theeffect of formulated FCC catalyst composition on the one-stepcracking of Arabian light crude oil. Our results demonstrate thatover a 35 wt.% yield to light olefins can be achieved on spray-dried catalysts containing 1 : 1 mixtures of ZSM-5 and FAUzeolites (alongside binder and clay). Coke deposition andcatalyst deactivation can be correlated to the nature andcontent of each zeolite component.