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When using the 2.5-liter engine, the 2009 Subaru Outback requires 4.2 quarts of 5W-30 engine oil. For the 3.0-liter engine, you will need 5.8 quarts of the same viscosity oil. Subaru advises changing this oil and filter every 7,500 miles. If you frequently drive in heavy traffic or on dirt roads, it may be necessary to have this maintenance performed more frequently. Failing to replace old or low oil can lead to costly engine damage. This oil helps prevent corrosion, lubricates moving parts, and aids in keeping the engine cool. If the oil becomes old, you may experience decreased performance and fuel efficiency. The typical cost for an oil change in the 2009 Outback ranges from $100 to $160, with labor accounting for about $40 to $60 of that total.
For the 2009 Subaru Outback, it is best to use 5W-30 grade oil. You can determine the recommended oil grade for this vehicle by checking the API classification and SAE viscosity. The 2.5L engine of the 2009 Outback requires 4.2 US quarts (4.0 liters) of oil, while the 3.0L engine needs 5.8 quarts (5.5 liters) of oil.
Add an additional 0.5 quarts of oil if you are also changing the oil filter.