1998 GMC Savana Van Owner's Manual - Page 261

Rear Axle When to Check and Change Lubricant Refer to the Maintenance Schedule determine how to often to check the lubricant and when to change it. See "Scheduled Maintenance Services" in the Index. What to Use Refer to the Maintenance Scheduleto determine what kind of lubricant to use. See "Recommended Fluids and Lubricants" in the Index. Engine Coolant The cooling s stem in your vehicle is filled with DEX-COOL engine coolant. This coolant is designea to remain in your vehicle for 5 years or 150,000miles (240 000 km) whichever occurs first, if you add only DEX-COOL6 extended life coolant. How to Check Lu'_ ~ I 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. 2 The following explains your cooling system and how to 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 protectionup to 265 " F (129"C). 0 0 0 Protect against rust and corrosion. Help keep the proper engine temperature. Let the warning lights and gages work as they should. 6-21