2018 Mazda 3 Oil Type and Capacity: Exact Specs
By the CarsDailyHub Editorial Team | Automotive writers; every article fact-checked against Mazda’s owner’s manual and OEM service documentation | Updated June 2026
Quick Answer: The 2018 Mazda 3 with the 2.0L Skyactiv-G takes about 4.5 US quarts of 0W-20 with a filter change, and the 2.5L Skyactiv-G takes about 4.8 US quarts of 0W-20. Mazda recommends 0W-20 for the Skyactiv-G engines (with 5W-30 acceptable in some regions/conditions as the manual allows). Full or synthetic-blend 0W-20 is the right choice; always confirm the level at the dipstick.
This guide covers engine oil specifications for the 2018 Mazda 3 (2.0L and 2.5L Skyactiv-G engines). Last reviewed: June 2026.
Table of Contents
- 2018 Mazda 3 Oil Specs by Engine
- Oil Type and Viscosity (0W-20 and Skyactiv)
- Oil Filter Information
- How Often to Change the Oil
- How to Change the Oil (Quick Steps)
- Frequently Asked Questions
- Sources & References
2018 Mazda 3 Oil Specs by Engine
| Engine | Oil Capacity (with filter) | Recommended Viscosity | Oil Type |
|---|---|---|---|
| 2.0L Skyactiv-G | ~4.5 US qt (4.2 L) | 0W-20 | Synthetic or synthetic blend |
| 2.5L Skyactiv-G | ~4.8 US qt (4.5 L) | 0W-20 | Synthetic or synthetic blend |
Capacities are approximate and assume a filter change. Fill to the dipstick mark rather than relying only on the quoted figure, and check the oil-fill cap for the marked viscosity.
Oil Type and Viscosity (0W-20 and Skyactiv)
Mazda’s Skyactiv-G engines are designed around low-viscosity 0W-20 oil, which supports their high compression ratio and efficiency focus. For the 2018 Mazda 3, 0W-20 is the primary recommendation. In some regions or under certain high-temperature conditions, the owner’s manual lists 5W-30 as an acceptable alternative, but 0W-20 is the standard for best fuel economy and cold-start protection.
A quality synthetic or synthetic-blend 0W-20 is the right choice. Because Skyactiv engines are tuned for this thin oil, do not substitute a heavier grade without checking the manual for your market and conditions.
Oil Filter Information
The 2018 Mazda 3 uses a spin-on oil filter (common Mazda part numbers include PE01-14-302 or the equivalent for your engine). Replace it at every oil change with a genuine Mazda filter or a reputable equivalent rated for your interval.
How Often to Change the Oil
- Synthetic 0W-20, normal driving: roughly every 7,500 miles, following the maintenance schedule and any oil-life indicator.
- Severe service (short trips, extreme temperatures, dusty conditions, heavy idling): change closer to every 5,000 miles.
- At least once a year even at low mileage.
Mazda’s recommended intervals depend on driving conditions, so lean toward the shorter end if you do mostly short trips, and reset the maintenance reminder after each change.
How to Change the Oil (Quick Steps)
- Warm the engine briefly, shut it off, and raise the car safely.
- Drain the oil from the drain plug into a pan.
- Replace the spin-on oil filter.
- Reinstall the drain plug with a fresh washer, torqued to spec.
- Refill with about 4.5 quarts (2.0L) or 4.8 quarts (2.5L) of 0W-20.
- Run the engine, check for leaks, and recheck the dipstick.
- Reset the maintenance reminder and record the mileage.
Frequently Asked Questions
Q: How much oil does a 2018 Mazda 3 take?
A: The 2.0L Skyactiv-G holds about 4.5 US quarts with a filter change, and the 2.5L holds about 4.8 US quarts. These figures are approximate, so add most of the oil, run the engine briefly, then check the dipstick and top up to the mark. Always confirm against your owner’s manual.
Q: What oil does a 2018 Mazda 3 use?
A: Mazda recommends 0W-20 for the 2018 Mazda 3’s Skyactiv-G engines, which are designed around this thin oil for efficiency. A synthetic or synthetic-blend 0W-20 is the right choice. In some regions or hot conditions the manual lists 5W-30 as acceptable, but 0W-20 is the standard recommendation.
Q: Can I use 5W-30 in my 2018 Mazda 3?
A: In some markets and under certain high-temperature conditions, Mazda’s owner’s manual lists 5W-30 as an acceptable alternative, but 0W-20 is the primary recommendation for the Skyactiv-G engines and gives the best fuel economy and cold-start protection. Check your specific manual before using 5W-30, and default to 0W-20 otherwise.
Q: Do Skyactiv engines need special oil?
A: They are designed around low-viscosity 0W-20, so using the specified grade matters for both efficiency and proper oiling. You do not need a Mazda-branded oil, any reputable synthetic or synthetic-blend 0W-20 meeting the required specification is fine, but you should stick with the 0W-20 viscosity the engine was engineered for.
Q: How often should I change the oil in a 2018 Mazda 3?
A: With synthetic 0W-20 and normal driving, roughly every 7,500 miles following the maintenance schedule and oil-life indicator. Under severe service, short trips, extreme temperatures, or dusty conditions, change closer to every 5,000 miles. Change at least once a year regardless of mileage, and reset the reminder each time.
Sources & References
- Mazda Motor Corporation, 2018 Mazda 3 Owner’s Manual
- Mazda service information for the 2.0L and 2.5L Skyactiv-G engines and 0W-20 specification
- Mazda oil filter part references
- Industry oil-change interval guidance
Related articles on CarsDailyHub:
– Engine Oil Capacity and Type: Vehicle-Specific Guide
– 2010 Mazda 3 Oil Type and Capacity
– Engine Oil Capacity Chart for the United States
– Overdue Oil Change Symptoms
