K 1500 Yukon 4WD V8-5.3L VIN Z Flex Fuel (2003)
Engine Oil: Fluid Type Specifications
Engine Oil
API Classification ......................................................................................................................................................................... Look for Starburst Symbol
Above -18° C (0° F) ................................................................................................................................................................... 10W-30, 5W-30 (preferred)
Below -18° C (0° F) .................................................................................................................................................................................................... 5W-30