What kind of oil does a 2018 Chevy Silverado 2500HD take?
The answer depends on the engine: the 6.0L gasoline engine uses Dexos1 Gen 2 0W-20, while the available 6.6L Duramax diesel uses Dexos2 5W-40 synthetic.
In this article, we explain the oil requirements by engine option for the 2018 Silverado 2500HD, how to confirm the correct grade, and how to keep lubrication up to standard for heavy‑duty use. Always cross-check your owner’s manual or the oil fill cap on your vehicle for the exact specification.
Engine options and oil specifications
Gasoline engine: 6.0L V8
For the 6.0L gasoline engine found in some 2018 Silverado 2500HD models, use Dexos1 Gen 2 0W-20 synthetic motor oil that is GM-approved. This grade supports reliable cold starts and fuel efficiency in typical operating conditions.
Oil specification to use:
- Dexos1 Gen 2 0W-20 full synthetic motor oil (GM-approved).
- Choose a product clearly labeled Dexos1 Gen 2 to ensure compatibility with GM engines.
- Follow GM’s maintenance intervals and regularly check oil level and condition.
Bottom line for the gasoline option: Dexos1 Gen 2 0W-20 synthetic oil is the recommended choice for the 6.0L gas engine in the 2018 Silverado 2500HD.
Duramax diesel engine: 6.6L
For the 6.6L Duramax diesel, the recommended oil is Dexos2 5W-40 synthetic motor oil that meets GM Dexos2 specifications, suitable for the high-heat, heavy‑duty operation typical of diesel use.
Oil specification to use:
- Dexos2 5W-40 synthetic motor oil (GM Dexos2-approved).
- Verify Dexos2 approval on the bottle and follow climate-specific guidance in the manual or on the fill cap.
Bottom line for the diesel option: Dexos2 5W-40 synthetic oil is the standard recommendation for the Duramax in the 2018 Silverado 2500HD, with adherence to prescribed service intervals.
Summary
In short, the 2018 Silverado 2500HD requires different oils depending on the engine. The 6.0L gas engine uses Dexos1 Gen 2 0W-20, while the Duramax 6.6L diesel uses Dexos2 5W-40. Always confirm with the owner’s manual and the oil fill cap, choose GM-approved formulations, and follow the manufacturer’s recommended maintenance schedule to ensure optimal engine health.
