2005 Cadillac CTS Oil Type & Capacity: 5W-30 (6.0 quarts)
The 2005 Cadillac CTS takes 5W-30 motor oil — 6.0 quarts with a filter change, per the factory service manual.
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| Base, 2.8 T, Automatic | 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, 2.8 T, Standard | 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 7, Automatic | 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 7, Standard | 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. |
| V | 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. |
More factory specs & repair guides for your CTS
🛞 2005 Cadillac CTS Tire Size & Pressure →🌧️ 2005 Cadillac CTS Wiper Blade Sizes →💡 2005 Cadillac CTS Light Bulb Sizes →📖 2005 Cadillac CTS Factory Service Manual →All fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner network AllOEMManuals.com.
Coolant capacity
10.6 quarts (10.03 L) — 50/50 mixture of DEX-COOL and clean drinkable water
Frequently asked questions
What type of oil does a 2005 Cadillac CTS take?
The 2005 Cadillac CTS takes 5W-30 motor oil (API - SAE 5W-30), per the factory service manual.
What is the oil capacity of a 2005 Cadillac CTS?
The 2005 Cadillac CTS oil capacity is 6.0 quarts with a filter change.
How often should I change the oil in my 2005 Cadillac CTS?
Most 2005 Cadillac CTS 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 2005 Cadillac CTS?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 2005 Cadillac CTS. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.