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The 2004 Mazda RX-8 is equipped with a consistent 1.2L 2-cylinder engine, meaning that no matter your trim level or setup, you'll be using the same engine oil. It is advised to use 3.7 quarts of SAE 5W-20 conventional motor oil. Opting for synthetic oil in this vehicle could potentially harm engine performance, so it's recommended to stick with conventional oil for the RX-8. In situations where you can't find SAE 5W-20, you can temporarily use SAE 5W-30, though this is not ideal as it can lead to increased friction over time, resulting in premature wear and likely early engine failure. To ensure the engine operates smoothly, it is best to follow the manufacturer's recommendation for oil type with the lowest weight.
The recommended oil for the 2004 Mazda RX8 is SAE 5W-20 fully synthetic motor oil.
My 2004 RX8 doesn't come with that kind of engine - it's equipped with a unique 1.3-liter 2R rotary engine.
Use conventional 5w-20 oil in the RX8 because it is designed to burn oil, so do not use synthetic oil.