1993 GMC Jimmy Owner's Manual - Page 289

How to Check Lubricant: If the level is belowthebottomofthefillerplughole,you'llneedtoadd somelubricant. If thedifferentialisatoperatingtemperature(warm),addenoughlubricantto of thefillerplughole. raisetheleveltothebottom I thedifferential is cold,addenoughlubricanttoraisethelevelto f (12 mm)belowthefillerplughole. What to Use: RefertotheMaintenanceSchedule to determinewhatkind use.See"RecommendedFluidsandLubricants"intheIndex. 1/2 inch of lubricantto Engine Coolant The following' explains your cooling system and how to add coolant when it is low. If youhaveaproblemwithengineoverheating,see"Engine Overheating"intheIndex. The proper coolant for your vehicle will: Givefreezingprotectiondownto 20°F (-28°C) or -34°F (-37°C) for Canadianvehiclesandvehicleswithcoldclimateoption. Giveboilingprotectionup to 258°F (125°C). Protectagainst rust andcorrosion. Helpkeeptheproperenginetemperature. Letthewarning lights and gages work astheyshould. 6-23