Quick answer: the 2018–2021 Mazda6 2.5L engine takes 4.8 qt (4.5 L) of SAE 0W-20 with a filter change. The 2.5L turbo takes 5.1 qt (4.8 L) of SAE 5W-30.
| Engine | Oil capacity (with filter) | Oil type |
|---|---|---|
| 2.5L SKYACTIV-G (non-turbo) | 4.8 qt (4.5 L) | 0W-20 |
| 2.5L SKYACTIV-G Turbo | 5.1 qt (4.8 L) | 5W-30 |
The turbo uses a different oil. Check whether your engine is the 2.5 Turbo before buying 0W-20.
Oil capacity by year
| Model year | 2.5L | 2.5L turbo |
|---|---|---|
| 2018 | 4.8 qt | 5.1 qt |
| 2019 | 4.8 qt | 5.1 qt |
| 2020 | 4.8 qt | 5.1 qt |
| 2021 | 4.8 qt | 5.1 qt |
We read the Capacities and Recommended Oil pages of every manual listed under Sources. Capacities without a filter change are about 0.2 L (0.2–0.3 qt) lower.
Recommended oil type
Mazda specifies SAE 0W-20 (API “Certified For Gasoline Engines”, ILSAC) for the non-turbo SKYACTIV-G engines in the U.S. and Canada.
For the 2.5L turbo, Mazda specifies SAE 5W-30 (API “Certified For Gasoline Engines”).
How to reset the oil life on the 2018–2021 Mazda6
See also: Oil life reset by brand.
Mazda shows oil change reminders through the Maintenance Monitor. After the oil change, open the Maintenance Monitor in Mazda Connect (Applications or Information, depending on the system), select Oil Change and reset it. The exact menu path is in the Mazda Connect owner’s manual for your car.
Oil change tips
- Both engines: one 5-quart jug is enough.
- The capacity is approximate. After refilling, run the engine briefly, turn it off, wait a few minutes and check that the level is between the marks on the dipstick before adding more.
Sources and how we checked
All capacities and oil grades on this page come from Mazda’s online owner’s manuals for the U.S. market, published on mazdausa.com (Specifications → Capacities, and Engine Oil → Recommended Oil):
- 2018 Mazda6 owner’s manual: Capacities
- 2019 Mazda6 owner’s manual: Capacities
- 2020 Mazda6 owner’s manual: Capacities
- 2021 Mazda6 owner’s manual: Capacities
If your owner’s manual shows something different, follow your manual and tell us.
Last checked: October 26, 2026.
FAQ
How much oil does a Mazda6 take?
4.8 qt (4.5 L) with a filter change for the 2.5L; 5.1 qt (4.8 L) for the 2.5 Turbo.
What oil does a Mazda6 use?
SAE 0W-20 for the 2.5L and SAE 5W-30 for the 2.5 Turbo.
Can I use 5W-30 in the non-turbo Mazda6?
Mazda’s U.S. manuals specify 0W-20 for the non-turbo engine.
Is a 5-quart jug enough?
Yes for both engines.
How do I reset the oil change reminder?
Reset the Oil Change item in the Maintenance Monitor in Mazda Connect.
See all Mazda oil capacities.