The 2018 GMC Denali with the 6.2-liter V8 requires Dexos1 Gen 2 certified 0W-20 synthetic motor oil.
In detail, GM specifies Dexos1 Gen 2 0W-20 for the 6.2L V8 in this model year. Using the correct viscosity and specification ensures proper lubrication, fuel efficiency, and emissions performance, and it helps protect warranty coverage. Always consult the owner's manual and use a GM-approved oil and filter. Oil capacity for this engine is typically around eight quarts with a filter, and service intervals are guided by the vehicle’s oil life monitor.
Oil specification and certification
Here is what to look for when selecting oil for the 6.2L Denali to ensure compatibility and performance.
- Dexos1 Gen 2 certification on the oil bottle
- Viscosity rating of 0W-20
- Full synthetic oil or a synthetic blend that is Dexos1 Gen 2 compliant
- Suitable for modern GM engines and emissions control systems
Choosing oil that meets Dexos1 Gen 2 and the 0W-20 specification helps ensure reliable cold-start protection and consistent performance across operating conditions. Do not substitute with non-Dexos oils unless your manual explicitly allows it, and avoid using 5W-30 if Dexos1 Gen 2 0W-20 is specified for your engine.
Practical guidance for maintenance
Before changing oil or shopping for a replacement, keep these pointers in mind to stay aligned with GM’s recommendations.
Oil change basics
Follow the owner's manual or the GM Oil Life Monitor to determine when to change the oil. Use a GM-approved oil filter in addition to the Dexos1 Gen 2 0W-20 oil.
Many owners prefer professional service to ensure correct drain plug torque, proper filter seating, and to maintain warranty coverage. Using the right oil and filter helps keep the engine clean and performing as designed.
Where to source the right oil
Reliable sources include GM dealerships, authorized service centers, and major automotive retailers that stock Dexos1 Gen 2 0W-20 synthetic oils labeled for GM vehicles.
Summary: For a 2018 GMC Denali with the 6.2L V8, the recommended oil is Dexos1 Gen 2 certified 0W-20 synthetic motor oil, used with a GM-approved filter, and changes should follow the owner's manual and oil life monitor.