The 2018 Mazda3 requires different oil quantities depending on the engine: about 4.1 quarts for the 2.0-liter engine and about 4.5 quarts for the 2.5-liter engine, including the replacement filter. Always verify the exact amount for your car with the owner's manual or the under-hood information sticker.
Engine options and oil capacity
The following figures reflect the two gasoline engine options offered in the 2018 Mazda3 and their typical oil capacities when performing a full change with a new filter.
- 2.0-liter SKYACTIV-G I4: approximately 4.1 quarts (with filter)
- 2.5-liter SKYACTIV-G I4: approximately 4.5 quarts (with filter)
Note: Oil capacity can vary slightly by market, trim level, and whether the filter is replaced. For the most accurate specification, consult the owner's manual or the service information label under the hood.
Oil type and maintenance tips
Mazda generally recommends synthetic 0W-20 oil for the SKYACTIV-G engines in the 2018 Mazda3. Using the correct oil grade helps maintain optimal protection, fuel efficiency, and engine longevity. When changing oil, replace the filter, ensure the drain plug gasket is in good condition, and recheck the oil level with the dipstick after filling.
Summary
In short, the 2018 Mazda3’s oil capacity depends on the engine: about 4.1 quarts for the 2.0L and about 4.5 quarts for the 2.5L, with minor variations by market and service practices. Always confirm the exact amount for your vehicle in the owner's manual or on the under-hood information label.