Friction Modifiers
WARNING: This page is about a different car, the 2005 Saturn L300. However, it is still accessible from the selected car via links, so may be relevant.
These are the newest members of the family of additives in modern oils. They further reduce surface friction between moving parts. Friction modifiers, along with low viscosity, make "Energy Conserving" and similarly labeled oils possible. Such oils can increase a vehicle's fuel economy by several percent.