The 2017 GMC Sierra 5.3L V8 uses Dexos1 Gen 2 synthetic motor oil, with SAE 5W-30 being the most commonly recommended viscosity.
Oil specification and compliance
The engine's oil requirements are defined by GM's Dexos1 Gen 2 specification. Oils that meet this standard are designed to protect the EcoTec3 V8, control emissions, and maintain engine performance across typical Sierra operating conditions.
Below are the core guidelines you should follow when selecting oil for this engine.
- Oil type: Dexos1 Gen 2 synthetic motor oil (certified by GM).
- Viscosity: SAE 5W-30 is the standard recommendation for most climates; consult the owner's manual for any climate-specific deviations.
- Certification: Use oil with the Dexos1 Gen 2 certification mark on the bottle to ensure compatibility.
Always consult the owner's manual or your GMC dealer to confirm the exact specification for your vehicle, especially if you live in extreme temperatures or have a unique driving pattern.
Climate considerations and verification
While Dexos1 Gen 2 and 5W-30 cover the vast majority of conditions for a 2017 Sierra, high- or low-temperature environments can influence the best viscosity choice. Check the owner’s manual, the oil fill cap, or the GM service portal for any climate-specific notes.
Summary
For a 2017 GMC Sierra 5.3L V8, use Dexos1 Gen 2 synthetic motor oil, typically SAE 5W-30. Verify the exact spec on your owner’s manual or under the hood label, and ensure the oil carries the Dexos1 Gen 2 certification.