2021 Mazda CX-9 Oil Type & Capacity: 5W-30 (5.1 quarts)
The 2021 Mazda CX-9 takes 5W-30 motor oil — 5.1 quarts with a filter change, per the factory service manual.
Factory-spec answer
5W-30 — 5.1 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| Carbon Edition, AWD | API - ILSAC, SAE 5W-30 Engine Oil | 5.10 QTS. | 4.90 QTS. | — |
| Carbon Edition, FWD | API - ILSAC, SAE 5W-30 Engine Oil | 5.10 QTS. | 4.90 QTS. | — |
| Grand Touring, AWD | API - ILSAC, SAE 5W-30 Engine Oil | 5.10 QTS. | 4.90 QTS. | — |
| Grand Touring, FWD | API - ILSAC, SAE 5W-30 Engine Oil | 5.10 QTS. | 4.90 QTS. | — |
| Signature | API - ILSAC, SAE 5W-30 Engine Oil | 5.10 QTS. | 4.90 QTS. | — |
| Sport, AWD | API - ILSAC, SAE 5W-30 Engine Oil | 5.10 QTS. | 4.90 QTS. | — |
| Sport, FWD | API - ILSAC, SAE 5W-30 Engine Oil | 5.10 QTS. | 4.90 QTS. | — |
| Touring, AWD | API - ILSAC, SAE 5W-30 Engine Oil | 5.10 QTS. | 4.90 QTS. | — |
| Touring, FWD | API - ILSAC, SAE 5W-30 Engine Oil | 5.10 QTS. | 4.90 QTS. | — |
More factory specs & repair guides for your CX-9
🛞 2021 Mazda CX-9 Tire Size & Pressure →🌧️ 2021 Mazda CX-9 Wiper Blade Sizes →💡 2021 Mazda CX-9 Light Bulb Sizes →📖 2021 Mazda CX-9 Factory Service Manual →All fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner network AllOEMManuals.com.
Coolant capacity
10.5 quarts (9.93 L). Use FL22 type coolant in vehicles with the inscription "FL22" on the radiator cap itself or the surrounding area. For vehicles without "FL22" inscription use a mixture of demineralized water and ethylene-glycol-based coolant. Do not use solution that contains more than 60% antifreeze. Above -16Deg. C {3.2Deg. F} 65% water/35% coolant. Above -26Deg.C {-15Deg.F} 55% water/45% coolant. Above -40 Deg. C {-40Deg.F} 45% water/55% coolant.
Frequently asked questions
What type of oil does a 2021 Mazda CX-9 take?
The 2021 Mazda CX-9 takes 5W-30 motor oil (API - ILSAC, SAE 5W-30 Engine Oil), per the factory service manual.
What is the oil capacity of a 2021 Mazda CX-9?
The 2021 Mazda CX-9 oil capacity is 5.1 quarts with a filter change, or 4.9 quarts without changing the filter.
How often should I change the oil in my 2021 Mazda CX-9?
Most 2021 Mazda CX-9 owners follow a 5,000–7,500 mile interval with conventional oil, or up to 10,000 miles with full synthetic. Always check the oil life monitor if equipped, and consult your owner's manual — Mazda recommends intervals based on driving conditions, not just mileage.
Can I use synthetic oil in my 2021 Mazda CX-9?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 2021 Mazda CX-9. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.