The recommended oil type for a Chevy Silverado with the 5.3L engine depends on the year of the truck and the specific engine specifications. However, it generally calls for
5W-30 motor oil that meets the dexos1 specification from GM.
Always check your owner's manual. This is the most reliable source for the exact oil type and viscosity recommended for your specific Silverado 5.3L engine and year. The manual will also specify the correct oil capacity.