2002 Chevrolet Express Van Owner's Manual - Page 394

Part D: Recommended Fluids and Lubricants Fluids and lubricants identified below by name, part number or specification may be obtained from your dealer. USAGE FLUID/LUBRICANT USAGE Engine Oil (Diesel Engine) FLUID/LUBRICANT Engine oil with the letters CH-4 or CG-4 is best for your vehicle. The CH-4 or CG-4 designation may appear either alone, or in combination with other API designations, such as API CH-4/SJ, CG-4/SH or CH-4/CG-4/SJ. These letters show American Petroleum Institute (API) levels of quality. To determine the preferred viscosity for your vehicle's diesel engine, see "Engine Oil" in the Index. 50/50 mixture of clean, drinkable water and use only GM GoodwrenchR DEX-COOLR or HavolineR DEX-COOLR Coolant. See "Engine Coolant" in the Index. Engine Oil Engine oil with the American (Gasoline Engine) Petroleum Institute Certified for Gasoline Engines starburst symbol of the proper viscosity. To determine the preferred viscosity for your vehicle's engine, see "Engine Oil" in the Index. Engine Coolant 7-55