Mobil 1 0W-20 is an advanced full synthetic motor oil designed for maximum engine efficiency, wear protection, and fuel economy in modern gasoline and hybrid engines. Available in 5-liter bottles, this low-viscosity oil (often labeled as Advanced Fuel Economy or ESP x2) meets strict industry standards (API SP, ILSAC GF-6) to reduce sludge and prevent low-speed pre-ignition (LSPI).