100% synthetic low viscosity oils that maximize the performance of hybrid vehicles equipped with gasoline engines and electric motors. They are suitable for both plug-in hybrid electric vehicles (PHEV) and hybrid electric vehicles (HEV). These engine oils are designed to withstand the harsh operating conditions imposed by start-stop systems and to protect the internal combustion engine even in the most adverse situations when there is a continuous change from one drive mode to another. In addition, these products offer fuel economy benefits under typical driving conditions, which not only reduces fuel consumption, but also helps reduce CO2 emissions into the atmosphere. Therefore, these oils are the perfect choice for environmentally conscious hybrid electric vehicle owners.