2003 Buick Regal Oil Type & Capacity
The 2003 Buick Regal takes 10W-30 motor oil — 4.5 quarts with a filter change, per the factory service manual.
Factory-spec answer
10W-30 — 4.5 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| GS | API - SAE 10W-30 | 4.50 QTS. | — | — |
| LS | API - SAE 10W-30 | 4.50 QTS. | — | — |
Buy the right oil
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More specs & repair guides for your Regal
2003 Buick Regal factory service manualAll fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner site AllOEMManuals.com.
Coolant capacity
11.7 quarts (11.07 L) — 50/50 mixture of DEX-COOL and clean drinkable water
Frequently asked questions
What type of oil does a 2003 Buick Regal take?
The 2003 Buick Regal takes 10W-30 motor oil (API - SAE 10W-30), per the factory service manual.
How much oil does a 2003 Buick Regal take?
The 2003 Buick Regal holds 4.5 quarts with a filter change.
Can I use synthetic oil in my 2003 Buick Regal?
Yes. 10W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 2003 Buick Regal. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.