These low viscosity synthetic lubricants maximize the performance of hybrid vehicles equipped with gasoline and electric engines. They are suitable for both, plug-in hybrid electric vehicles (PHEV) and hybrid electric vehicles (HEV). These engine oils are designed to withstand the severe operating conditions imposed by start-stop systems, and protect the combustion engine even under the most unfavorable situations when continuous switching from one engine to the other occur. Moreover, these products offer Fuel Economy benefits under standard driving conditions, which not only lowers fuel consumption, but it also contributes to reduce the CO2 emissions to the atmosphere. Hence, these lubricants are the perfect choice for environmentally conscious owners of hybrid electric vehicles.