The 2018 Chevy Volt uses Dexos1 Gen 2 0W-20 full-synthetic engine oil.
This article explains the exact oil specification, typical capacity, service intervals, and practical tips for sourcing and changing the oil on the 2018 Volt’s gasoline engine, which powers the range-extended system.
Oil specifications for the 2018 Volt
Understanding the correct oil specification helps protect the 1.5-liter gasoline engine that supports the Volt’s hybrid system. The recommended oil is Dexos1 Gen 2 compliant and has a viscosity of 0W-20. Using the proper grade enhances cold-start protection, fuel economy, and overall engine longevity. Always verify the precise spec on the oil cap or in the owner’s manual, as GM’s Dexos1 Gen 2 standard is used across many recent GM engines.
What Dexos1 Gen 2 0W-20 means
Dexos1 Gen 2 is GM’s certification for passenger-car gasoline engines. The 0W-20 designation indicates the oil’s viscosity at cold start (0 weight) and its performance when warm (20). For the Volt, 0W-20 synthetic oil is chosen to optimize efficiency and protection in a wide range of temperatures. If you’re shopping, look for “Dexos1 Gen 2 0W-20” on the label or the product description.
- Dexos1 Gen 2 certified 0W-20 full-synthetic oil (preferred for the 2018 Volt).
- If Dexos1 Gen 2 0W-20 is unavailable, use a Dexos1-certified 0W-20 oil that matches GM’s spec and avoid non-Dexos oils or thicker grades such as 5W-30.
- Avoid conventional (non-synthetic) oils that do not meet Dexos1 Gen 2 specifications.
Using the correct Dexos1 Gen 2 0W-20 helps protect the engine and supports the Volt’s efficiency and emissions targets. When in doubt, consult the owner’s manual or a GM-certified technician.
Oil capacity and service intervals
Knowing the engine’s oil capacity and service interval helps plan maintenance and avoid over- or under-filling. The following guidelines apply to the 2018 Volt’s gas engine.
- Engine oil capacity (with filter): approximately 4.5 quarts (about 4.3–4.7 quarts may be needed depending on the exact drain and filter). Always confirm the exact figure in your vehicle’s manual or on the service label.
- Oil change interval: typically around every 7,500 miles (12,000 km) under normal driving, or 12 months, whichever comes first, when using Dexos1 Gen 2 0W-20 synthetic oil. Your vehicle’s Oil Life Monitoring System (OLM) will also indicate when it’s time for a change.
- Oil filter: replace with a filter that meets GM’s Dexos1 Gen 2 specification during every oil change.
Sticking to the recommended capacity and interval helps maintain engine protection, especially given the Volt’s hybrid powertrain and frequent temperature changes. Reset the oil life monitor after each service for accurate aging readings.
Practical tips for buying and changing oil
To ensure you’re using the right oil and avoiding common pitfalls, keep these tips in mind when shopping or replacing the oil.
Where to source and how to verify the spec
Check the oil container label for Dexos1 Gen 2 and 0W-20. If you’re unsure, ask a GM service advisor or reference the owner’s manual. When performing a DIY change, ensure you use a GM-approved Dexos1 Gen 2 0W-20 oil and a compatible Dexos1 Gen 2 oil filter.
By following these guidelines, you’ll maintain the Volt’s gasoline engine in good condition while supporting its hybrid performance and fuel economy.
Summary
In short, a 2018 Chevy Volt requires Dexos1 Gen 2 0W-20 full-synthetic engine oil. Expect to use about 4.5 quarts (with filter) and follow a maintenance interval of roughly 7,500 miles or 12 months, whichever comes first, with the Oil Life Monitoring System providing guidance. Always verify the exact specification on the oil cap or in the owner’s manual, and opt for Dexos1 Gen 2 0W-20 to ensure optimal protection and efficiency.