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In 2005, the Subaru Legacy featured a 2.5 L 4-cylinder engine that requires SAE 5W-30 oil. The Legacy requires about 4.4 quarts of oil with a filter. Oil is essential for keeping the engine clean, running smoothly, and reducing friction between moving parts. It is recommended to change the oil every 7,000 miles, or every 3,500 miles if the Legacy is a Turbo model. Previously, even Turbo models required an oil change every 7,000 miles, but Subaru revised this to 3,500 miles for Turbo models and all years post-2005. Professional oil changes typically cost between $20 and $30 in labor charges.
The engine choices for the 2005 Subaru Legacy, including the 2.5L box-4 turbo and non-turbo models, require the use of 5W-30 synthetic oil.