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2005 Mazda 6s, ( V6, 3.0) takes 6 US quarts if you change the oil filter..5.5 quarts if you don't change the filter. Recommended oil is SAE 5W20. The four cylinder (2.5 liter engine) takes 4.5 us quarts if you change the filter and 4.1 us quarts if you don't change the oil filter. They both use the same viscosity of oil because of the vast temperature range of the 5W20 grade oil.

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15y ago

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