The 2021 GMC Sierra with the 5.3 L V8 engine takes 8 quarts (about 7.6 liters) of engine oil for a full oil change with a new filter.
Capacity specifics for the 5.3 L V8
The 5.3 L EcoTec3 V8 has an official oil capacity of 8 quarts (7.6 L) when performing a standard oil change with the filter replaced. This is the typical figure cited by GM for the 2021 Sierra/Silverado with that powerplant. Minor variations can occur based on filter type or production changes, so it’s best to verify with the owner’s manual or a GM service bulletin for your exact VIN.
Notes on variation
While 8 quarts is the standard amount, some setups or filters might lead to small differences. Always rely on the dipstick and factory documentation for final confirmation on your specific vehicle.
Practical guidance for an oil change
When planning an oil change, stock up on 8 quarts (7.6 L) of the recommended synthetic oil and a fresh oil filter. Use the GM-recommended specification (Dexos1 Gen 2) for the 5.3 L V8, and reset the oil-life monitor after the change. Also ensure the drain plug gasket is in good condition and torque specs are followed.
How to verify oil level after changing
After adding oil, run the engine briefly, then park on level ground and let it settle. Check the dipstick to ensure the level is within the FULL range. If needed, add small amounts and recheck to avoid overfilling, which can cause engine issues.
Summary
For the 2021 GMC Sierra with the 5.3 L V8, the oil capacity is 8 quarts (approximately 7.6 liters) for a standard oil change with a new filter. Always confirm exact capacity for your VIN via the owner’s manual or a GM dealer, and use the recommended Dexos1 Gen 2 synthetic oil.