Complete Oil Specifications
Your 2021 Mazda CX-5 2.5L with SKYACTIV-G technology requires premium low-viscosity synthetic oil for optimal compression ratio performance.
Quick Reference
| Specification | Value |
|---|---|
| Viscosity | 0W-20 |
| API Rating | SP, SN |
| ILSAC Rating | GF-6A |
| Capacity (with filter) | 4.8 quarts |
| Oil Filter | Mazda PE01-14-302A |
| Normal Interval | 7500 miles |
Why 0W-20 is Critical for SKYACTIV Technology
The CX-5’s 2.5L SKYACTIV-G engine features Mazda’s high-compression technology (13:1 ratio) that demands low-viscosity 0W-20 synthetic. This oil provides instant flow during cold starts while protecting against the higher pressures of Mazda’s efficient engine design.
Using incorrect oil will:
- ❌ Reduce engine efficiency and fuel economy
- ❌ Increase engine wear under high compression
- ❌ Void Mazda’s powertrain warranty
Mazda-Approved Oil Brands
-
✅ Mazda Genuine 0W-20 Dexelia
-
✅ Mobil 1 Advanced Fuel Economy 0W-20
-
✅ Castrol Edge 0W-20
-
✅ Pennzoil Platinum 0W-20
-
✅ Idemitsu 0W-20
Mazda recommends Dexelia specification oil, but any API SN or SP with ILSAC GF-6A is acceptable. Full synthetic is required.
Severe Service Check
You need the 5000-mile interval if you:
- Make frequent short trips under 5 miles
- Drive in extreme temperatures
- Operate in stop-and-go traffic frequently
- Drive on dusty or unpaved roads
- Tow trailers (CX-5 can tow up to 2,000 lbs)
Installation Details
Drain Plug Torque: 26 ft-lbs
Proper torque is critical—the CX-5 uses a crush washer that should be replaced.
OEM Filter: Mazda PE01-14-302A
Aftermarket Filters:
-
Mobil 1 M1-110A
-
K&N HP-1017
-
Bosch 3330
Access: The oil filter is accessed from underneath. A skid plate may need removal on AWD models.
FAQs
What oil does a 2021 Mazda CX-5 2.5L take?
0W-20 full synthetic oil meeting API SN or SP and ILSAC GF-6A standards.
How many quarts does it need?
4.8 quarts with a new filter.
Can I use 5W-20 or 5W-30?
Mazda specifically requires 0W-20. In extreme emergencies, 5W-20 can be used temporarily, but return to 0W-20 as soon as possible.
Is synthetic required?
Yes. Mazda requires full synthetic 0W-20 for SKYACTIV engines.
How often should I change the oil?
Every 7,500 miles for normal driving, or every 5,000 miles for severe service.
Does the turbocharged CX-5 use different oil?
No. The 2.5L Turbo also uses 0W-20 synthetic oil.