Mazda recommends using SAE 5W-20 motor oil for both the 2.0L and 2.5L engines. They also recommend looking for brands that are “certified for gasoline engines.”
If 5W-20 isn’t available, you can use 5W-30, but make sure to replace it with the proper type at the following oil change. The Mazda 3 can take between 4.5 and 5.3 quarts of oil (if you have a turbocharged engine, it may need up to 6).
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