2012 Toyota Prius Owners Manual - Page 802

6-1. Specifications Oil viscosity (0W-20 is explained here as an example): • The 0W in 0W-20 indicates the characteristic of the oil which allows cold startability. Oils with a lower value before the W allow for easier starting of the engine in cold weather. • The 20 in 0W-20 indicates the viscosity characteristic of the oil when the oil is at high temperature. An oil with a higher viscosity (one with a higher value) may be better suited if the vehicle is operated at high speeds, or under extreme load conditions. How to read oil container label: The ILSAC (International Lubricant Standardization and Approval Committee) Certification Mark is added to some oil containers to help you select the oil you should use. Cooling system Capacity Gasoline engine Power control unit 5.6 qt. (5.3 L, 4.7 Imp. qt.) 1.7 qt. (1.6 L, 1.4 Imp. qt.) Use either of the following: • "Toyota Super Long Life Coolant" • A similar high-quality ethylene glycolbased non-silicate, non-amine, non-nitrite, and non-borate coolant with long-life hybrid organic acid technology Do not use plain water alone. Coolant type 494