1998 Chevrolet Express Van Owner's Manual - Page 260

Rear Axle When to Check and Change Lubricant Refer to the Maintenance Schedule to determine how often to check the lubricant and when to change it. See "Scheduled Maintenance Services" in the Index. What to Use Refer to the Maintenance Schedule to determine what kind of lubricant to use. See "Recommended Fluids and Lubricants" in the Index. Engine Coolant The cooling s stem in your vehicleis filled with DEX-COOL engine coolant. This coolant is designed to remain in yourvehicle for 5 years or 150,000 miles (240 000 kmg whichever occurs first, if you add only DEX-COOL extended life coolant. How to Check Lubricant If the level is below the bottom of the filler plug hole, you'll need to add some lubricant. Add enough lubricant to raise the level to the bottom of the filler plug hole. 8 The following explains your cooling system and howto add coolant when it is low. If you have a problem with engine overheating, see "Engine Overheating" in the Index. A 50/50 mixture of water and DEX-COOL@ coolant will: 0 Give freezing protection down to -34°F (-37°C). Give boiling protection up to 265 " F (129"C). Protect against rust and corrosion. 0 Help keep the proper engine temperature. Let the warning lights and gages work as they should. 0