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In your 2010 Mazda3, it's recommended to use a full synthetic Mercon ATF fluid like Valvoline MaxLife, priced at $30 at O'Reilly's. This fluid works well for both topping up low transmission fluid levels and doing a complete flush. For your regular engine oil, go for a synthetic SAE 5W-20 motor oil to fill the 5.3 quart reservoir. Unlike the ATF fluid, you can adjust the engine oil viscosity to suit your location; opting for a thinner oil can improve engine performance.
The 2010 Mazda 3 requires ATF M-V fluid for its automatic transmission.
The recommended automatic transmission fluid for a 2010 Mazda 3 is ATF M-V.
ATF M-V is the preferred type of ATF. It's important to note that Mercon V and M-V are not interchangeable fluids.