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A 2005 Mazda3 with a 2.3L 4-cylinder engine should use full synthetic 5W-20 motor oil. When the filter is included, the engine requires 4.5 US quarts of oil, and 4.9 US quarts without it. The oil drain plug has a 17mm head size and should be torqued to 22 ft-lbs if using a torque wrench to remove it. The oil change for this vehicle is relatively inexpensive, costing around $20 to $30 if done independently, and between $90 and $120 if taken to a shop for servicing.
The 2005 Mazda 3 2.3 is best suited with full synthetic motor oil of sae 5w-20 variety.