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The 2006 Subaru Impreza is equipped with a 2.5 L 4-cylinder engine that necessitates SAE 5W-30 Synthetic Motor Oil. It can hold 4.2 quarts with a filter, and the proper torque for the drain plug is 32.5 ft/lbs. Regular oil changes are essential for maintaining a clean and well-functioning engine. It is recommended to change the oil and filter every 5,000 to 7,000 miles, especially if driving in more challenging conditions. The cost per quart typically ranges from $5 to $12, resulting in a total of approximately $21 to $50 to fill the engine with 4.2 quarts of oil. Performing an oil change is a straightforward task that can be completed in just 5 to 20 minutes. Necessary tools include a drain pan, ratchet, socket, and socket extensions.
Subaru provides three variations of the 2.5L box-4 engine for the 2006 Impreza. These include the standard 2.5L box-4 version, the turbocharged 2.5L box-4 version with the engine code EJ255 E Turbo, and the turbocharged 2.5L box-4 version with the engine code EJ257 F Turbo. The non-turbo 2.5L engine uses 4.4 quarts of synthetic 5W30 oil, while the turbocharged 2.5L engine with the engine code EJ255 E Turbo requires 4.2 quarts of the same oil. Lastly, the turbocharged 2.5L engine with the engine code EJ257 F Turbo needs 4.5 quarts of specifically formulated synthetic 5W30 oil.