BRAND NEW IN THE GENUINE BOTTELS 6 Pack OEM Genuine Toyota Synthetic Motor Oil 00279-0WQTE-01 SAE 0W-20 Part of the reason for the lighter oil is for fuel economy. It DOES take\ a lot of energy to pump oil to the proper pressure-- and of course the heaver the viscosity, the more energy is required. 0W-20 Advanced Fuel Economy synthetic oil is engineered to help improve fuel economy in vehicles. An advanced full synthetic motor oil, it is designed to help deliver outstanding engine protection and enhanced fuel economy.