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The 2011 Subaru Impreza requires full synthetic motor oil with SAE 5w-30 viscosity for the turbo engine and 0w-20 for the non-turbo engine. It has an oil capacity of 4.4 quarts. You can buy the necessary oil in one-quart containers from various retailers, auto parts stores, and reputable online sellers. Prices range from $3.22 to $16.29 per quart. You may also want to consider purchasing a funnel priced between $1.30 and $3.84 to avoid spills when refilling the oil. Before adding new oil, make sure to drain the old oil from the reservoir through the drain valve nozzle located at the bottom.
In the US, the 2011 Subaru Impreza non-turbo and turbo models should use 5W-30 oil. If synthetic 5W-30 isn't available, conventional 5W-30 or 5W-40 can be used as a temporary measure, but it's recommended to switch back to synthetic 5W-30 at the next oil change. Subaru suggests using synthetic oil that meets API Service and ILSAC standards. The oil capacity for these models is 4.4 US quarts (4.2 liters).
How frequently do I need to replace the motor oil in my car's engine?