To find the correct engine oil capacity for your specific 2005 Mazda 6, I recommend:
1. Check your owner's manual: The most reliable source for this information is your car's owner's manual. It will specify the exact capacity for your vehicle's engine.
2. Consult a Mazda dealership or mechanic: They can access detailed information about your specific model and engine.
3. Use an online resource: Websites like Mazda's official website or reliable automotive repair websites may have information about your specific model.
Please note that the engine oil capacity can also vary depending on whether you are changing the oil and filter or just the oil. Always refer to your owner's manual for the most accurate information.