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The 2004 Subaru Impreza is designed to run on SAE 5w-30 fully synthetic motor oil to maintain its engine performance. With an oil capacity of 4.8 quarts, you can find one-quart bottles priced between $2 to $34 at most auto stores and online retailers. When it comes time for an oil change, start by draining the old oil from the reservoir through the drain valve nozzle. Professional labor for an oil change typically costs between $30 and $132. To refill the reservoir, remove the plastic cap on top and use a funnel to add the new oil until it reaches the maximum fill line.
In 2004, the Subaru Impreza comes with two engine options. The base 2.0L box-4 model requires 4.8 quarts of synthetic oil, while the optional 2.5L box-4 version, known as the WRX, needs 4.2 quarts. The 2004 Subaru Impreza WRX STi, equipped with a 2.5L box-4 turbo engine, uses 4.8 quarts of synthetic oil. According to Subaru's recommendations, the preferred viscosity is 5W30, but 10W30 or 10W40 can also be used when the temperature is above -4°F. For towing or heavy use in temperatures above 95°F, options include 30 weight, 40 weight, 10W50, 20W40, or 20W50 oil.