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The 2007 Mazda CX7 came with a 2.3-liter 4-cylinder engine as standard, available across all trims with no other engine options available. This specific engine requires synthetic 5W-30 motor oil and has a 6-quart capacity including the oil filter. To refill the engine, you'll need a 1.5-gallon jug, which is a more cost-effective option than buying multiple individual quart bottles. Expect to spend approximately $30 to $40 on the necessary oil. The oil drain plug, with a 17mm head, will need around 25 ft-lb of torque for removal.
The recommended oil for the 2007 Mazda CX7 is 5W-30 synthetic.