The amount of oil a 2018 GMC Sierra 1500 needs depends on the engine installed, with common configurations ranging from about 6 quarts to 8 quarts during a full oil change. The base 4.3L V6 takes roughly 6 quarts, while the more common V8 options and the diesel variant typically require around 8 quarts (with filter).
Engine options and oil capacity
The Sierra 1500 was offered with several engines in 2018. Here are typical capacities by engine to help you plan a change:
- 4.3L V6: about 6 quarts (with filter)
- 5.3L V8: about 8 quarts (with filter)
- 6.2L V8: about 8 quarts (with filter)
- 3.0L Duramax Turbo-Diesel: about 8 quarts (with filter)
Note: Exact capacity can vary slightly by model year, drivetrain, and filter type. Always confirm with the owner's manual or a dealer for your specific build.
Practical tips for oil changes and checks
When performing an oil change, replace the oil filter and use the recommended viscosity and specification for your engine. After filling to the expected capacity, start the engine and let it run briefly, then check the level with the dipstick and add small amounts of oil as needed until it reads within the full range. For maintenance intervals, synthetic oil changes are commonly planned about every 7,500 miles under normal driving, with more frequent changes under severe conditions.
Step-by-step quick guide
Before you start: gather the right oil type and filter for your engine. Then:
- Drain old oil and replace the filter.
- Pour in the recommended amount for your engine (start with the lower end if you're unsure).
- Run the engine, check for leaks, and recheck the dipstick.
- Bring the level up to the full mark if needed.
Following these steps helps ensure you use the correct total volume and maintain proper engine lubrication.
Summary
The 2018 GMC Sierra 1500’s oil capacity varies by engine. The 4.3L V6 typically requires about 6 quarts, while the 5.3L and 6.2L V8s, as well as the 3.0L Duramax diesel, typically require about 8 quarts (all figures assume a standard oil filter change). Always verify the exact capacity for your specific configuration in the owner's manual or with a dealership, and use the recommended oil type and change interval for optimal engine health.