The Sierra 2018 with the 5.3 L V8 requires Dexos1 Gen 2 oil with a viscosity of 0W-20, typically a full synthetic option.
GM’s 2018 Sierra 1500 owners manual specifies Dexos1 Gen 2 as the oil specification and 0W-20 as the preferred viscosity. Using the correct oil helps protect the engine, optimize fuel economy, and maintain warranty compliance. Below is a concise guide to what this means for purchase, maintenance, and basic care.
Official specification and viscosity
For the 5.3 L V8 in the 2018 Sierra 1500, GM’s guidance centers on two key factors: the oil must meet the Dexos1 Gen 2 specification, and the viscosity should be 0W-20. This combination is designed to deliver reliable cold-start protection, efficient lubrication, and engine longevity across typical driving conditions.
Before you shop for oil, keep in mind several practical points that help ensure you pick the right product and avoid common pitfalls.
- Oil specification: Dexos1 Gen 2 certified on the bottle.
- Viscosity: 0W-20 is the recommended grade for this engine.
- Oil type: Most Dexos1 Gen 2 oils are synthetic or synthetic blends; check the label to confirm Dexos Gen 2 approval and 0W-20 rating.
- Approximate capacity: About 8 quarts (with filter) for a full drain and fill.
Using Dexos1 Gen 2 0W-20 as specified helps ensure proper lubrication under a range of temperatures and preserves the engine’s warranty coverage.
Practical notes for maintenance and buying tips
When purchasing oil, look for the Dexos1 Gen 2 logo alongside the 0W-20 viscosity on the bottle. If you’re shopping for a replacement during a trip or at a garage, ask for Dexos1 Gen 2 0W-20 and verify the quantity you’ll need for an oil change (including the filter). Always consult the owner's manual for the exact capacity and any climate-specific recommendations.
Additional considerations
While 0W-20 is the standard recommendation for this engine, always adhere to GM’s guidelines and verify any changes in the official manual or with a GM service advisor. Substituting non-Dexos1 Gen 2 oil can affect lubrication performance and warranty coverage.
Summary
The 2018 GMC Sierra 1500 with the 5.3 L V8 takes Dexos1 Gen 2 oil with a viscosity of 0W-20, typically in a full synthetic form. Confirm the Dexos Gen 2 and 0W-20 labeling on the oil you purchase, and plan for roughly 8 quarts of oil plus a filter during an oil change. For the most accurate guidance, refer to the owner’s manual or check with a GM dealership or certified technician.