2003 Kia Optima Oil Type & Capacity
The 2003 Kia Optima oil type depends on the engine: the LX, 2.4 6, Automatic takes 5W-30 (4.5 quarts with filter); the LX, 2.4 6, Standard takes 5W-30 (4.5 quarts with filter); the LX, 2.7 8 takes 5W-30 (5.1 quarts with filter); the SE, 2.4 6 takes 5W-30 (4.5 quarts with filter); the SE, 2.7 8 takes 5W-30 (5.1 quarts with filter), per the factory service manual.
Factory-spec answer
It depends on the engine:
- LX, 2.4 6, Automatic: 5W-30, 4.5 quarts with filter
- LX, 2.4 6, Standard: 5W-30, 4.5 quarts with filter
- LX, 2.7 8: 5W-30, 5.1 quarts with filter
- SE, 2.4 6: 5W-30, 4.5 quarts with filter
- SE, 2.7 8: 5W-30, 5.1 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| LX, 2.4 6, Automatic — 2.4L Eng | API - SAE 5W-30 | 4.50 QTS. | — | — |
| LX, 2.4 6, Standard — 2.4L Eng | API - SAE 5W-30 | 4.50 QTS. | — | — |
| LX, 2.7 8 — 2.7L Eng | API - SAE 5W-30 | 5.10 QTS. | — | — |
| SE, 2.4 6 — 2.4L Eng | API - SAE 5W-30 | 4.50 QTS. | — | — |
| SE, 2.7 8 — 2.7L Eng | API - SAE 5W-30 | 5.10 QTS. | — | — |
Buy the right oil
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More specs & repair guides for your Optima
2003 Kia Optima factory service manualAll fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner site AllOEMManuals.com.
Coolant capacity
6.9 quarts (6.52 L) — 50/50 mixture of Ethylene Glycol Antifreeze and water
Frequently asked questions
What type of oil does a 2003 Kia Optima take?
It depends on the engine: LX, 2.4 6, Automatic uses 5W-30; LX, 2.4 6, Standard uses 5W-30; LX, 2.7 8 uses 5W-30; SE, 2.4 6 uses 5W-30; SE, 2.7 8 uses 5W-30.
How much oil does a 2003 Kia Optima take?
Capacity depends on the engine: LX, 2.4 6, Automatic holds 4.5 quarts with filter; LX, 2.4 6, Standard holds 4.5 quarts with filter; LX, 2.7 8 holds 5.1 quarts with filter; SE, 2.4 6 holds 4.5 quarts with filter; SE, 2.7 8 holds 5.1 quarts with filter.
Can I use synthetic oil in my 2003 Kia Optima?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 2003 Kia Optima. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.