GM Service Manual Online
For 1990-2009 cars only

Approximate Fluid Capacities for Chevrolet Chevy C Silverado - 2WD (CNG) 2004

Engine Cooling System

6.0L (VIN U) With RPO KL5 without optional engine oil cooler

14.5L (15.3 qts)

6.0L (VIN U) With RPO KL5 with optional engine oil cooler

14.1L (14.9 qts)