1995 GMC Suburban Owner's Manual - Page 315

How to Check Lubricant If the level is below the bottom of the filler plug hole, you'll need to add some lubricant. If the differential is at operating temperature (warm), add enough lubricant to raise the level to the bottom of the filler plug hole. ( 12 m n ) below I f the differential is cold, add enough lubricant to raise the level to 1/2 inch the filler plug hole. 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 following explains your coolingsystem and how to add coolant when it is low. If you have a problem with engine overheating, see "Engine Overheating" i n the Index. The proper coolant for your vehicle will: Give freezing protection down to -34°F (-37°C). Give boiling protection up to 262°F (128°C). Protect against rust and corrosion. 0 Help keep the proper engine temperature. Let the warning lights and gages work as they should. What to Use Use a mixture of one-half clecur wcrter (preferably distilled)and one-half antifreeze that meets "GM Specification 6038-M," which won't damage aluminum parts. You can also use a recycled coolant conforming to "GM 6-33