The 2009 Mazda3 oil type and capacity iS5w-20 and 4.5 quarts. Your oil needs to be changed out someday. Every 5,000 to 10,000 miles or so is a good rule of thumb. If You don't replace it, there will be problems with the engine. Having high quality oil is essential for the engine to run smoothly. You will run into problems with the oil at some point. A common problem is an awful burning odor. This needs to be viewed closely as soon as possible or the car might explode. Old or bad oil can cause the engine to stop working. Knocking noise may arise from the engine. You could experience poor gas mileage.
Mara D.
January 2, 2020
The 2009 Mazda 3 recommends using only an oil that meets Mazda Standards. The SAE classification 5W-20 is the best engine oil for the 2009 Mazda 3. The 2009 Mazda 3 engine oil capacity is 4.5 US quarts (4.2 liters).
mohamed
November 3, 2020
My mazda now is running 238000 whichthe sae classification is better for the engine
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