2018 Cadillac CT6 Oil Type & Capacity
The 2018 Cadillac CT6 oil type depends on the engine: the 2.0L takes 5W-30 (5.0 quarts with filter); the 2.0L takes 5W-30 (5.0 quarts with filter); the 3.0L takes 5W-30 (6.0 quarts with filter); the 3.0L takes 5W-30 (6.0 quarts with filter); the 3.0L takes 5W-30 (6.0 quarts with filter); the 3.6L takes 5W-30 (6.0 quarts with filter); the 3.6L takes 5W-30 (6.0 quarts with filter); the 3.6L takes 5W-30 (6.0 quarts with filter); the 3.6L takes 5W-30 (6.0 quarts with filter); the Plug-In takes 5W-30 (5.0 quarts with filter), per the factory service manual.
Factory-spec answer
It depends on the engine:
- 2.0L: 5W-30, 5.0 quarts with filter
- 2.0L: 5W-30, 5.0 quarts with filter
- 3.0L: 5W-30, 6.0 quarts with filter
- 3.0L: 5W-30, 6.0 quarts with filter
- 3.0L: 5W-30, 6.0 quarts with filter
- 3.6L: 5W-30, 6.0 quarts with filter
- 3.6L: 5W-30, 6.0 quarts with filter
- 3.6L: 5W-30, 6.0 quarts with filter
- 3.6L: 5W-30, 6.0 quarts with filter
- Plug-In: 5W-30, 5.0 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| 2.0L — 2.0L Eng | API - SAE 5W-30 | 5.00 QTS. | — | Use only engine oil licensed to the dexos1 specification, or equivalent, of the proper SAE viscosity grade. ACDelco dexos1 Synthetic Blend is recommended. If in an area of extreme cold, where the temperature falls below -20Deg.F (-29Deg.C), an SAE 0W-30 oil may be used. An oil of this viscosity grade will provide easier cold starting for the engine at extremely low temperatures. |
| 2.0L — 2.0L Eng | API - SAE 5W-30 | 5.00 QTS. | — | Use only engine oil licensed to the dexos1 specification, or equivalent, of the proper SAE viscosity grade. ACDelco dexos1 Synthetic Blend is recommended. If in an area of extreme cold, where the temperature falls below -20Deg.F (-29Deg.C), an SAE 0W-30 oil may be used. An oil of this viscosity grade will provide easier cold starting for the engine at extremely low temperatures. |
| 3.0L — 3.0L Eng | API - SAE 5W-30 | 6.00 QTS. | — | Use only engine oil licensed to the dexos1 specification, or equivalent, of the proper SAE viscosity grade. ACDelco dexos1 Synthetic Blend is recommended. If in an area of extreme cold, where the temperature falls below -20Deg.F (-29Deg.C), an SAE 0W-30 oil may be used. An oil of this viscosity grade will provide easier cold starting for the engine at extremely low temperatures. |
| 3.0L — 3.0L Eng | API - SAE 5W-30 | 6.00 QTS. | — | Use only engine oil licensed to the dexos1 specification, or equivalent, of the proper SAE viscosity grade. ACDelco dexos1 Synthetic Blend is recommended. If in an area of extreme cold, where the temperature falls below -20Deg.F (-29Deg.C), an SAE 0W-30 oil may be used. An oil of this viscosity grade will provide easier cold starting for the engine at extremely low temperatures. |
| 3.0L — 3.0L Eng | API - SAE 5W-30 | 6.00 QTS. | — | Use only engine oil licensed to the dexos1 specification, or equivalent, of the proper SAE viscosity grade. ACDelco dexos1 Synthetic Blend is recommended. If in an area of extreme cold, where the temperature falls below -20Deg.F (-29Deg.C), an SAE 0W-30 oil may be used. An oil of this viscosity grade will provide easier cold starting for the engine at extremely low temperatures. |
| 3.6L — 3.6L Eng | API - SAE 5W-30 | 6.00 QTS. | — | Use only engine oil licensed to the dexos1 specification, or equivalent, of the proper SAE viscosity grade. ACDelco dexos1 Synthetic Blend is recommended. If in an area of extreme cold, where the temperature falls below -20Deg.F (-29Deg.C), an SAE 0W-30 oil may be used. An oil of this viscosity grade will provide easier cold starting for the engine at extremely low temperatures. |
| 3.6L — 3.6L Eng | API - SAE 5W-30 | 6.00 QTS. | — | Use only engine oil licensed to the dexos1 specification, or equivalent, of the proper SAE viscosity grade. ACDelco dexos1 Synthetic Blend is recommended. If in an area of extreme cold, where the temperature falls below -20Deg.F (-29Deg.C), an SAE 0W-30 oil may be used. An oil of this viscosity grade will provide easier cold starting for the engine at extremely low temperatures. |
| 3.6L — 3.6L Eng | API - SAE 5W-30 | 6.00 QTS. | — | Use only engine oil licensed to the dexos1 specification, or equivalent, of the proper SAE viscosity grade. ACDelco dexos1 Synthetic Blend is recommended. If in an area of extreme cold, where the temperature falls below -20Deg.F (-29Deg.C), an SAE 0W-30 oil may be used. An oil of this viscosity grade will provide easier cold starting for the engine at extremely low temperatures. |
| 3.6L — 3.6L Eng | API - SAE 5W-30 | 6.00 QTS. | — | Use only engine oil licensed to the dexos1 specification, or equivalent, of the proper SAE viscosity grade. ACDelco dexos1 Synthetic Blend is recommended. If in an area of extreme cold, where the temperature falls below -20Deg.F (-29Deg.C), an SAE 0W-30 oil may be used. An oil of this viscosity grade will provide easier cold starting for the engine at extremely low temperatures. |
| Plug-In — 2.0L Eng | API - SAE 5W-30 | 5.00 QTS. | — | Use only engine oil licensed to the dexos1 specification, or equivalent, of the proper SAE viscosity grade. ACDelco dexos1 Synthetic Blend is recommended. If in an area of extreme cold, where the temperature falls below -20Deg.F (-29Deg.C), an SAE 0W-30 oil may be used. An oil of this viscosity grade will provide easier cold starting for the engine at extremely low temperatures. |
Buy the right oil
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More specs & repair guides for your CT6
2018 Cadillac CT6 factory service manualAll fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner site AllOEMManuals.com.
Coolant capacity
9.1 quarts (8.61 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 2018 Cadillac CT6 take?
It depends on the engine: 2.0L uses 5W-30; 2.0L uses 5W-30; 3.0L uses 5W-30; 3.0L uses 5W-30; 3.0L uses 5W-30; 3.6L uses 5W-30; 3.6L uses 5W-30; 3.6L uses 5W-30; 3.6L uses 5W-30; Plug-In uses 5W-30.
How much oil does a 2018 Cadillac CT6 take?
Capacity depends on the engine: 2.0L holds 5.0 quarts with filter; 2.0L holds 5.0 quarts with filter; 3.0L holds 6.0 quarts with filter; 3.0L holds 6.0 quarts with filter; 3.0L holds 6.0 quarts with filter; 3.6L holds 6.0 quarts with filter; 3.6L holds 6.0 quarts with filter; 3.6L holds 6.0 quarts with filter; 3.6L holds 6.0 quarts with filter; Plug-In holds 5.0 quarts with filter.
Can I use synthetic oil in my 2018 Cadillac CT6?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 2018 Cadillac CT6. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.