The vehicle uses Dexos1-certified 5W-30 motor oil.
For the 2008 Silverado 1500 with the 5.3L V8, GM specifies a 5W-30 oil that meets the Dexos1 specification (Gen 1 for this era). You can choose conventional or synthetic oil as long as it is Dexos1-compliant, and the engine’s oil capacity is roughly 6 quarts with a filter. Always verify the exact specification in the owner’s manual and look for the Dexos1 label on the bottle.
Oil specification and compatibility
These items help you shop for the right oil.
- Dexos1 certification: choose a 5W-30 that explicitly states Dexos1 (Gen 1 for this period) on the label.
- Viscosity: 5W-30 is standard for the 5.3L V8 in this year.
- Oil type: either conventional or synthetic is acceptable as long as Dexos1 is specified.
- Capacity: the engine holds about 6 quarts of oil with a typical filter change.
- Filter: use a quality oil filter; refer to GM’s parts listing for the correct filter for the 5.3L.
Using an oil that isn’t Dexos1 can affect lubrication and warranty coverage, so verify the Dexos1 label before purchase.
Dexos1 Gen 1 vs Gen 2
The 2008 model year GM trucks use Dexos1 Gen 1. If you’re uncertain, check the product data on the bottle or GM service information for your vehicle’s exact VIN and engine code.
Where to buy and how to verify
When shopping, read the label carefully to ensure you’re getting Dexos1-certified 5W-30 oil.
- Look for “Dexos1” on the bottle and confirm the viscosity is 5W-30.
- Choose reputable brands; OEM-recommended brands are fine options.
- In cold climates, synthetic 5W-30 is often preferred for easier starts in winter.
If in doubt, consult the owner’s manual or a Chevy dealer or qualified mechanic to verify the correct oil specification for your exact engine variant and climate.
Summary
Bottom line: For a 2008 Chevy Silverado 1500 with the 5.3L V8, use Dexos1-certified 5W-30 motor oil (conventional or synthetic). The engine capacity is about 6 quarts with a filter, and always verify the label and fitment for your vehicle in the owner’s manual or GM’s service information.