2003 Mazda 6 Oil Type & Capacity
The 2003 Mazda 6 oil type depends on the engine: the i, Automatic takes 5W-20 (4.5 quarts with filter); the i, Standard takes 5W-20 (4.5 quarts with filter); the s, Automatic takes 5W-20 (5.5 quarts with filter); the s, Standard takes 5W-20 (5.5 quarts with filter), per the factory service manual.
Factory-spec answer
It depends on the engine:
- i, Automatic: 5W-20, 4.5 quarts with filter
- i, Standard: 5W-20, 4.5 quarts with filter
- s, Automatic: 5W-20, 5.5 quarts with filter
- s, Standard: 5W-20, 5.5 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| i, Automatic — 2.3L Eng | API - SAE 5W-20 Super Premium Engine Oil | 4.50 QTS. | 4.10 QTS. | — |
| i, Standard — 2.3L Eng | API - SAE 5W-20 Super Premium Engine Oil | 4.50 QTS. | 4.10 QTS. | — |
| s, Automatic — 3.0L Eng | API - SAE 5W-20 Super Premium Engine Oil | 5.50 QTS. | 5.00 QTS. | — |
| s, Standard — 3.0L Eng | API - SAE 5W-20 Super Premium Engine Oil | 5.50 QTS. | 5.00 QTS. | — |
Buy the right oil
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More specs & repair guides for your 6
2003 Mazda 6 factory service manualAll fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner site AllOEMManuals.com.
Coolant capacity
7.9 quarts (7.47 L) — MAZDA Premium Engine Coolant. Above 3Deg.F (-16Deg.C) use: 35/65 mixture of antifreeze and water, above -15Deg. F (26Deg.C) use: 45/55 mixture of antifreeze and water, above -40Deg.F (40Deg.C) use: 55/45 mixture of antifreeze and water.
Frequently asked questions
What type of oil does a 2003 Mazda 6 take?
It depends on the engine: i, Automatic uses 5W-20; i, Standard uses 5W-20; s, Automatic uses 5W-20; s, Standard uses 5W-20.
How much oil does a 2003 Mazda 6 take?
Capacity depends on the engine: i, Automatic holds 4.5 quarts with filter; i, Standard holds 4.5 quarts with filter; s, Automatic holds 5.5 quarts with filter; s, Standard holds 5.5 quarts with filter.
Can I use synthetic oil in my 2003 Mazda 6?
Yes. 5W-20 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 2003 Mazda 6. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.