1998 Chevrolet Tracker Owner's Manual - Page 261

When the differential is cold, add enough lubricant to raise the level to 1/2 inch (12 below the filler mm) plug hole. When the differentialis at operating temperature (warm), add enough lubricant raise the level to to the bottom of the filler plug hole. What to Use Refer to the Maintenance Schedule to determine what kind of lubricant to use. "Recommended Fluids and See Lubricants" inthe Index. What to Use Use a mixtureof one-half clean water (preferably distilled) and one-half coolant that meets GM Specification 1825-M, which won't damage aluminum parts. You can also use a recycled coolant conforming to GM Specification 1825-M with a complete coolant flush and refill. you use this mixture, don't need If you to add anything else. Engine Coolant The following explains your cooling system and how to add coolant when is low. If youhave a it problem with engine overheating, see "Engine Overheating" in the Index. A 50/50 mixture of water andthe proper coolant will: 0 Give freezing protection down to -33°F (-36°C). Give boiling protection to 258 O F (1 25 C). up O Protect against rust and corrosion. Help keep the proper engine temperature. Let the warning lights and gages work as they should. Adding only plain water to your cooling system can be dangerous. Plain water, or some other liquid likealcohol, can boil before the proper coolant mixturewill. Your vehicle's coolant warning systemis set for the proper coolant mixture. With plain water the wrong mixture, or too your engine could get hot butyou wouldn't get the overheat warning. Your engine could catch fire and or otherscould be burned. you Use a 50/50 mixture of clean waterand the proper coolant.