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The 2016 Subaru Legacy should use 0W-20 synthetic motor oil, with a capacity of 5.1 quarts. It's advised to change the oil every 7,500 miles or annually, whichever comes first, to benefit the engine's longevity, fuel efficiency, and performance. Regular oil and filter changes help clear out debris and sludge from the engine, preventing potential issues. Neglecting oil changes can lead to engine problems as the oil deteriorates over time, becoming thinner, more abrasive, and causing wear on essential engine components. Synthetic oil is recommended for superior performance as it reduces friction, providing better engine protection.
Subaru suggests that for the 2016 Legacy, it is best to utilize 0W-20 synthetic oil.