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The oil capacity of your 2009 Subaru Legacy varies based on the engine size. A 2.5L engine can hold up to 4.2 US quarts of oil with a filter, while a 3.0L engine can take up to 5.8 US quarts. The type of oil to use is also determined by the engine size. The 2.5L engine requires SAE 5W-30 for all temperatures. If you are in a place where it is colder than -4F, then you should use 10W-30 or 10W-40. In temperatures above 95F, it is suggested to use 10W-50, 20W-40, or 20W-50. For the 3.0L engine, it is advised to use 10W-30 or 10W-40 in temperatures below -4F and 10W-50, 20W-40, or 20W-50 in temperatures above 95F.
The 2009 Subaru Legacy comes with two engine options: a 2.5L flat-4 (available in both turbo and non-turbo versions) and a 3.0L flat-6. The 2.5L engine requires 4.2 quarts of synthetic oil, and the 3.0L engine calls for 5.8 quarts of synthetic oil.