2012 Subaru Legacy Owner's Manual - Page 486

11-16 Maintenance and service 12. Start the engine and make sure that no oil leaks appear around the filter 's rubber seal and drain plug. 13. Keep the engine idling until the engine reaches the normal operating temperature range, as indicated by the temperature gauge on the combination meter. After that, check the engine oil level again. For further details about the check procedure, refer to "Checking the oil level" F11-12. conventional engine oil. When using synthetic oil, you must use oil of the same classification, viscosity and grade shown in this Owner 's Manual. Refer to "Engine oil" F12-4. Also, you must follow the oil and filter changing intervals shown in the Warranty and Maintenance booklet. Cooling system WARNING Never attempt to remove the radiator cap until the engine has been shut off and has cooled down completely. Since the coolant is under pressure, you may suffer serious burns from a spray of boiling hot coolant when the cap is removed. NOTE Synthetic oil of the grade and viscosity noted in chapter 12 is the recommended engine oil for optimum engine performance. Conventional oil may be used if synthetic oil is unavailable. & Recommended grade and viscosity CAUTION Use only engine oil with the recommended grade and viscosity. Refer to "Engine oil" F12-4. CAUTION . Vehicles are filled at the factory with SUBARU Super Coolant that does not require the first change for 11 years/137,500 miles (11 years/220,000 km). This coolant should not be mixed with any other brand or type of coolant during this period. Mixing with a different coolant will reduce the life of the coolant. Should it be necessary to top off the coolant for any reason, use only SUBARU Super Coolant. If the SUBARU Super Coolant is diluted with another brand or type, the maintenance interval is NOTE Engine oil viscosity (thickness) affects fuel economy. Oils of lower viscosity provide better fuel economy. However, in hot weather, oil of higher viscosity is required to properly lubricate the engine. & Synthetic oil You should use synthetic engine oil that meets the same requirements given for