There isn’t a single oil for all 2018 Chevrolet models. The correct oil depends on the specific model and engine, but most gasoline-equipped Chevrolets from that year require an oil that meets Dexos1 Gen 2 specifications, typically in 0W-20 or 5W-30 viscosity. Always verify with the owner’s manual or the under-hood label for your exact engine.
Dexos1 Gen 2 and GM’s oil standard
General Motors uses Dexos1 Gen 2 as the standard for most of its gasoline engines built in recent years. Oils meeting this standard are designed to deliver adequate protection, better fuel economy, and compatibility with GM engine technologies. For diesel-powered Chevrolets (Duramax), GM typically specifies Dexos2 lubricants. The exact viscosity—whether 0W-20, 5W-30, or another grade—depends on the engine and climate.
Oil types by engine family
The following is a practical guide to common 2018 Chevrolet engines. It’s not exhaustive; always confirm with the manual or a dealer.
- Gasoline engines (most models): Oils that meet Dexos1 Gen 2 specification. Viscosity commonly options 0W-20 or 5W-30, chosen by engine design and operating conditions.
- Diesel engines (Duramax variants): Oils that meet Dexos2 specification, typically synthetic, with viscosities such as 5W-40 depending on the model and operating climate.
- Performance-focused or specialty engines (e.g., certain Camaros or high-output variants): Often Dexos1 Gen 2 synthetic oil in a 0W-20 or 5W-30 grade, as specified by the owner’s manual.
Note: Specifications can vary by exact model, engine code, and market, so the manual or a Chevrolet service advisor should be your primary source.
How to confirm the exact oil specification for your vehicle
To guarantee you’re using the correct oil for your 2018 Chevy, follow these steps:
- Check the owner’s manual for the exact oil specification and viscosity required for your engine.
- Inspect the oil filler cap on the engine; it often lists the recommended viscosity and, in some cases, the Dexos requirement.
- Look at the placard on the driver’s door jamb or the under-hood label for maintenance fluids guidance.
- Consult Chevrolet’s official resources or contact a dealership service department for engine-specific guidance.
- When in doubt, use a Dexos1 Gen 2 synthetic oil in the viscosity recommended for your engine (commonly 0W-20 or 5W-30).
Following these steps helps ensure you protect your engine and comply with GM’s maintenance standards.
Summary
In short, a 2018 Chevy doesn’t have a universal oil. Most gasoline Chevrolets from that year require Dexos1 Gen 2 oil, typically in a 0W-20 or 5W-30 viscosity, depending on the engine. Diesel models use Dexos2 lubricants. The safest approach is to verify the exact specification in the owner's manual or with a Chevrolet dealer, and use a Dexos1 Gen 2 synthetic oil in the viscosity specified for your engine.