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To maximize fuel efficiency and extend the lifespan of your 2015 Subaru Legacy's engine, it's recommended to use Genuine Subaru oil with a viscosity rating of SAE 5W-30. The amount of oil the engine needs varies depending on the type of engine in your Legacy. The 2.5 L 4-cylinder engines require 5.1 quarts, while the 3.6 L 6-cylinder engines need 6.9 quarts. It's important to check the engine oil level at least once a week, ideally each time you fill up the gas tank. If the oil level drops below the recommended amount, be sure to top it up. It's also advised to change the oil every 6,000 miles or 6 months, whichever comes first, to ensure optimal performance and longevity.
Nope, you gotta use 0W-20 oil for an FB25 Boxer engine.
The 2015 Subaru Legacy models like the 2.5i, 2.5i Limited, and 2.5i Premium require approximately 5.1 quarts of oil for the engine. If you have the 3.6R Limited trim, you'll need around 6.9 quarts of oil for optimal performance.