2008 Cadillac STS Oil Type & Capacity
The 2008 Cadillac STS oil type depends on the engine: the Base, 3.6 V, AWD takes 5W-30 (6.0 quarts qt with filter); the Base, 3.6 V, RWD takes 5W-30 (6.0 quarts qt with filter); the Base, 4.6 A, AWD takes 5W-30 (8.0 quarts qt with filter); the Base, 4.6 A, RWD takes 5W-30 (8.0 quarts qt with filter); the V takes 5W-30 (9.0 quarts qt with filter), per the factory service manual.
Factory-spec answer
It depends on the engine:
- Base, 3.6 V, AWD: 5W-30, 6.0 quarts with filter
- Base, 3.6 V, RWD: 5W-30, 6.0 quarts with filter
- Base, 4.6 A, AWD: 5W-30, 8.0 quarts with filter
- Base, 4.6 A, RWD: 5W-30, 8.0 quarts with filter
- V: 5W-30, 9.0 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| Base, 3.6 V, AWD — 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. |
| Base, 3.6 V, RWD — 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. |
| Base, 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. |
| Base, 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. |
| V — 4.4L Eng | API - SAE 5W-30 | 9.00 QTS. | — | Use synthetic oil that meets GM Standard GM4718M. DO NOT use other viscosity oils such as SAE 20W-50. |
More factory specs & repair guides for your STS
🛞 2008 Cadillac STS Tire Size & Pressure →🌧️ 2008 Cadillac STS Wiper Blade Sizes →💡 2008 Cadillac STS Light Bulb Sizes →📖 2008 Cadillac STS Factory Service Manual →All fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner network AllOEMManuals.com.
Coolant capacity
11.7 quarts (11.07 L) — 50/50 mixture of DEX-COOL and clean drinkable water. All capacities are approximate. When adding, be sure to fill to the approximate level. Recheck the fluid level after filling.
Frequently asked questions
What type of oil does a 2008 Cadillac STS take?
It depends on the engine: Base, 3.6 V, AWD uses 5W-30; Base, 3.6 V, RWD uses 5W-30; Base, 4.6 A, AWD uses 5W-30; Base, 4.6 A, RWD uses 5W-30; V uses 5W-30.
What is the oil capacity of a 2008 Cadillac STS?
Oil capacity depends on the engine: Base, 3.6 V, AWD holds 6.0 quarts with filter; Base, 3.6 V, RWD holds 6.0 quarts with filter; Base, 4.6 A, AWD holds 8.0 quarts with filter; Base, 4.6 A, RWD holds 8.0 quarts with filter; V holds 9.0 quarts with filter.
How often should I change the oil in my 2008 Cadillac STS?
Most 2008 Cadillac STS 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 2008 Cadillac STS?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 2008 Cadillac STS. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.