2005 Cadillac STS Oil Type & Capacity
The 2005 Cadillac STS oil type depends on the engine: the 3.6 7 takes 5W-30 (6.0 quarts with filter); the 4.6 A, AWD takes 5W-30 (8.0 quarts with filter); the 4.6 A, RWD takes 5W-30 (8.0 quarts with filter), per the factory service manual.
Factory-spec answer
It depends on the engine:
- 3.6 7: 5W-30, 6.0 quarts with filter
- 4.6 A, AWD: 5W-30, 8.0 quarts with filter
- 4.6 A, RWD: 5W-30, 8.0 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| 3.6 7 — 3.6L Eng | API - SAE 5W-30 | 6.00 QTS. | — | Use synthetic oil that meets GM Standard GM4718M. DO NOT use other viscosity oils such as SAE 20W-50. |
| 4.6 A, AWD — 4.6L Eng | API - SAE 5W-30 | 8.00 QTS. | — | Use synthetic oil that meets GM Standard GM4718M. DO NOT use other viscosity oils such as SAE 20W-50. |
| 4.6 A, RWD — 4.6L Eng | API - SAE 5W-30 | 8.00 QTS. | — | Use synthetic oil that meets GM Standard GM4718M. DO NOT use other viscosity oils such as SAE 20W-50. |
Buy the right oil
Buy 5W-30 motor oil on Amazon2005 Cadillac STS oil filter on AmazonAs an Amazon Associate we earn from qualifying purchases made through these links.
More specs & repair guides for your STS
2005 Cadillac STS factory service manualAll fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner site AllOEMManuals.com.
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 2005 Cadillac STS take?
It depends on the engine: 3.6 7 uses 5W-30; 4.6 A, AWD uses 5W-30; 4.6 A, RWD uses 5W-30.
How much oil does a 2005 Cadillac STS take?
Capacity depends on the engine: 3.6 7 holds 6.0 quarts with filter; 4.6 A, AWD holds 8.0 quarts with filter; 4.6 A, RWD holds 8.0 quarts with filter.
Can I use synthetic oil in my 2005 Cadillac STS?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 2005 Cadillac STS. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.