K 3500 Truck 4WD V8-6.6L DSL Turbo VIN 1 (2001)
Engine Oil: Fluid Type Specifications
Engine Oil
API Classification ................................................................................................................................................................................................. CI-4, CH-4
Above -18° C (0° F) ................................................................................................................................................................. 10W-30, 15W-40 (preferred)
Below -18° C (0° F) .................................................................................................................................................................................................... 5W-30