2003 Cadillac Seville Oil Type & Capacity: 5W-30 (7.5 quarts)
The 2003 Cadillac Seville takes 5W-30 motor oil — 7.5 quarts with a filter change, per the factory service manual.
Factory-spec answer
5W-30 — 7.5 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| SLS | API - SAE 5W-30 | 7.50 QTS. | — | API - SAE 10W-30 can be use if SAE 5W-30 is not available and if it is going to be 0Deg.F (-18Deg.C) or above. |
| STS | API - SAE 5W-30 | 7.50 QTS. | — | API - SAE 10W-30 can be use if SAE 5W-30 is not available and if it is going to be 0Deg.F (-18Deg.C) or above. |
More factory specs & repair guides for your Seville
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Coolant capacity
13.0 quarts (12.3 L) — 50/50 mixture of DEX-COOL and clean drinkable water
Frequently asked questions
What type of oil does a 2003 Cadillac Seville take?
The 2003 Cadillac Seville takes 5W-30 motor oil (API - SAE 5W-30), per the factory service manual.
What is the oil capacity of a 2003 Cadillac Seville?
The 2003 Cadillac Seville oil capacity is 7.5 quarts with a filter change.
How often should I change the oil in my 2003 Cadillac Seville?
Most 2003 Cadillac Seville 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 — Cadillac recommends intervals based on driving conditions, not just mileage.
Can I use synthetic oil in my 2003 Cadillac Seville?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 2003 Cadillac Seville. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.