Most 2021 Cadillacs with the 3.6-liter V6 use about 5.7 quarts of engine oil with a replaceable oil filter, filled to the manufacturer's recommended level.
Understanding the 3.6L V6 and its oil capacity
Engine variants and potential capacity differences
The 3.6-liter V6 engines used in Cadillac models around 2021 belong to GM's LLT/LGX families. While there is a common capacity, the exact amount can vary slightly by engine code, accessory layout, and filter size. Always verify from the owner's manual or dealer literature for your specific vehicle, VIN, and engine code.
The following details reflect the typical spec for most 3.6L V6s in 2021 Cadillacs:
- Oil capacity (with filter): 5.7 quarts (5.4 liters)
- Recommended oil type: Dexos1 Gen 2-certified synthetic 5W-30
- Oil change interval: follow the owner's manual; typically around 7,500 miles (12,000 kilometers) for normal driving, with more frequent changes under severe conditions.
Because engine codes and hardware differ by model (for example XT5, CTS, CT6, etc.), you should confirm the exact specification for your vehicle using your VIN, the engine badge under the hood, or the official Cadillac service information.
Practical tips for maintaining oil levels
When topping off or replacing oil, pour the full 5.7 quarts, then recheck the level with the dipstick. Start the engine, run for a few minutes, turn off, and recheck to ensure the level is at the full mark. If you notice leaky seals or unusual consumption, consult a Cadillac technician.
Dexos1 Gen 2 5W-30 synthetic oil is widely recommended for 3.6L V6 engines, but always verify the current specification in your owner's manual or via a Cadillac dealer, as recommendations can update with new model years or regional service standards.
Summary
In most 2021 Cadillacs equipped with the 3.6-liter V6, the engine oil capacity is about 5.7 quarts with a filter, using Dexos1 Gen 2 5W-30 synthetic oil. Always verify the exact figure for your specific model and engine code, and follow Cadillac's maintenance schedule to ensure optimal engine health.