The short answer: Use Dexos1 Gen 2 5W-30 engine oil, preferably a full synthetic or synthetic blend, with about 8 quarts of oil capacity for a full change including the filter. Always check your vehicle’s owner’s manual for the exact specification for your model and climate.
Oil specification for the 2018 5.3L V8
GM’s 2018 5.3 L EcoTec3 V8 engines require Dexos1 Gen 2 certified oil. The recommended viscosity for most Silverado/Sierra/Tahoe/Suburban configurations is 5W-30. Using a Dexos1 Gen 2 approved 5W-30 oil helps meet warranty requirements and protects the engine under typical driving conditions. If you live in extreme climates or have other specific operating conditions, always defer to the manual for any climate‑specific notes.
- Dexos1 Gen 2 certified 5W-30 oil (full synthetic preferred; synthetic blend also acceptable if labeled Dexos1 Gen 2)
- Oil capacity: approximately 8 quarts (7.6 liters) with a new filter
- Oil must meet Dexos1 Gen 2 specification to maintain warranty and proper protection
For model-specific nuances or regional guidelines, consult the owner's manual or a Chevrolet dealer before purchasing oil.
Maintenance and change intervals
Regular maintenance ensures the 5.3 L runs cleanly and efficiently. The following points help guide oil changes and service timing.
- Use the vehicle’s oil life monitoring system to determine when an oil change is needed
- Typical change interval under normal driving: about 7,500–10,000 miles (12,000–16,000 km); more frequent if you tow, drive in extreme heat, or perform a lot of short trips
- Replace the oil filter with every oil change; use a Chevrolet-recommended or OEM part number
- Always verify the exact capacity and intervals in your owner’s manual, as specifications can vary by model year and configuration
Adhering to these guidelines helps maintain performance and protects warranty coverage.
Where to buy and how to verify
To ensure you meet GM’s Dexos1 Gen 2 standard, purchase oils labeled Dexos1 Gen 2 with a 5W-30 viscosity. When in doubt, ask your Chevrolet dealer or reference the latest GM service information for your exact vehicle configuration.
Summary
The 2018 Chevy 5.3 L V8 calls for Dexos1 Gen 2 5W-30 engine oil, preferably full synthetic, with an approximate capacity of 8 quarts for a full change including the filter. Use Dexos1 Gen 2 certified oil to maintain warranty eligibility, follow the vehicle’s oil life monitor for changes, and replace the filter at every interval. Always confirm exact specifications in the owner’s manual for your specific model and region.
What kind of oil goes in a 2018 Silverado 5.3 V8?
In general, the top Chevy Silverado 1500 oil type is SAE 0W-20 full synthetic motor oil from ACDelco's dexos1 standard for the 5.3L and 6.2L engines. For the smaller 2.7L TurboMax high-output engine, you'll need SAE 5W-30 full synthetic oil.
What is the best oil for a 5.3 L V8?
Most recent Silverado 1500 models with the 5.3L V8 or 6.2L V8 engines typically use SAE 0W-20 full synthetic motor oil.
Can I use 5W-30 instead of 0W-20 in Silverado?
Yes, you can use Dexos1 Gen 2 or Gen 3 5W-30 in your 2025 Silverado engine while you're in a specific location, especially if 0W-20 is unavailable. It is recommended to use 0W-20 for fuel economy (CAFE standards), but the 5.3L Gen V V8 engine is mechanically capable of running 5W-30, particularly in hot climates.
Can I run 5W-30 instead of 0W-20?
Modern engines designed for 0W-20 oil require specific viscosity for optimal performance, and using thicker 5W-30 oil may compromise efficiency while potentially voiding manufacturer warranties.