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The 2008 Subaru Impreza comes with two engine options: a 2.5 liter 4-cylinder engine that uses 4.4 US quarts of 5W-30 oil along with a filter, and a 2.0 liter engine that requires 4.2 quarts of the same oil. It is recommended to change the oil and filter every 7,500-10,000 miles or 12 months when using fully synthetic oil, or every 3,000-5,000 miles or 6 months with conventional oil. Synthetic oil offers advantages such as improved lubrication, longer service intervals, and better performance in extreme weather conditions. Thinner synthetic oil flows more easily in cold weather, protecting engine components from friction and corrosion. A typical oil change for the Impreza costs between $150-$200, including parts and labor.
Explanation: The oil volume is 4.2 quarts if you are not replacing the filter. It increases to 4.4 quarts when changing the filter.
John A.'s response contains some errors. My 2008 Impreza 2.5 non-turbo EJ253 has an oil capacity of 4.2 quarts, not 4.4 as mentioned. The manual states that synthetic 5W-30 can be used, though it is not mandatory for this car. It should be noted that newer Subaru models do mandate the use of synthetic oil.
In 2008, the Subaru Impreza offers three different engine choices: the 2.5L box-4 Non-Turbo, the 2.5L box-4 Turbo with engine code EJ255 E, and the 2.5L box-4 Turbo with engine code EJ257 F. The non-turbo 2.5L and the turbo EJ255 E both require 4.4 quarts of oil, while the EJ257 F turbo needs 4.5 quarts. All variants of the 2.5L engine require 5W30 synthetic oil.