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For the 2004 Mazda6 with the 3.0 L V6 engine, it requires 5W-20 Synthetic Motor Oil for optimal performance in all weather conditions. The vehicle's oil capacity is 5.5 quarts with a filter, and the recommended torque for the drain plug is between 16 and 21 ft/lbs. The 5W-20 specification indicates that the oil is relatively thin during startup (5), suitable for winter use (w), and maintains a viscosity level of 20 under regular operating conditions. Using oil is essential for keeping the engine clean and lubricated. It is advised to change the oil and filter approximately every 7,500 miles to maintain engine health since oil doesn't last indefinitely. The typical cost for an oil change ranges from $50 to $70 for labor, with additional charges for parts.
The recommended oil for a 2004 Mazda 6 V6 is SAE 5W-20.