2004 Toyota Prius Owners Manual - Page 296

Checking the coolant level Oil identification marks Either or both API registered marks are added to some oil containers to help you select the oil you should use. The API Service Symbol is located anywhere on the outside of the container. The top portion of the label shows the oil quality by API (American Petroleum Institute) designations such as SL. The center portion of the label shows the SAE viscosity grade such as SAE 5W−30. "Energy− Conserving" shown in the lower portion, indicates that the oil has fuel−saving capabilities. The ILSAC (International Lubricant Standardization and Approval Committee) Certification Mark is displayed on the front of the container. CAUTION The coolant heat storage tank reaches high temperature inside. It is dangerous if hot coolant is discharged when replacing. For replacement of the coolant, contact your Toyota dealer. Look at the see−through coolant reservoir when the hybrid system is cold. The coolant level is satisfactory if it is between the "FULL" and "LOW" lines on the reservoir. If the level is low, add the coolant. (For the coolant type, see "Coolant type selection" described below.) The coolant level in the reservoir will vary with hybrid system temperature. However, if the level is on or below the "LOW" line, add coolant. Bring the level up to the "FULL" line. If the coolant level drops within a short time after replenishing, there may be a leak in the system. Visually check the radiator, hoses, radiator cap and drain cock and water pump. To ensure excellent lubrication performance for your engine, "Toyota Genuine Motor Oil" is available, which has been specifically tested and approved for all Toyota engines. Please contact your Toyota dealer for further details about "Toyota Genuine Motor Oil". 284