The all new 2018 Rio is powered by a carryover but enhanced Gamma 1.6liter GDI fourcylinder engine with improved fuel efficiency (as described below), better responsiveness and low-speed driving dynamics. The main features of this unit are a high-pressure fuel system with direct injection, variable intake system, lowfriction oil seals, and piston cooling jets. The well-engineered power-plant also utilizes an aluminum valve cover and block for reduced weight, while incorporating cast iron linings meant for increased durability.