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The 2010 Subaru Legacy comes with two different engine types, each with its own oil capacity requirements. The 2.0L i-4 engine needs 4.5 US quarts (4.3 liters) of oil, while the 3.6L v6 engine requires 6 quarts (5.6 liters). It is recommended by the manufacturer to use licensed engine oils with the dexos1® certified certification sticker. The appropriate type of oil for both engine options is SAE 5w-30 full synthetic. Neglecting to change the oil can result in a loss of viscosity, leading to inadequate lubrication of engine components like pistons and cylinders. During prolonged use, the engine may also burn oil, so it's important to monitor oil levels regularly. Remember to replace the oil filter when changing the oil.
The 2010 Subaru Legacy needs to use 5w-30 full synthetic motor oil.