1995 GMC Sonoma Owner's Manual - Page 239

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 explainsyour cooling system and how to add coolant when it is low. If you have a problemwith engine overheating, see "Engine Overheating" in 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. 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 clean water (preferably distilled) and one-half antifreeze thatmeets "GM Specification6038-M," or "GM Specification 6043-M" with the 2.2L (LN2) Code4 engine, which won't damage aluminum parts. You can also use a recycled coolant conforming to "GM Specification 603%"' or "GM Specification 6043-M" with the 2.2L (LN2) Code 4 engine. Use GM Coolant Supplement (Sealer) with a complete coolant flushand refill. If you use this mixture, you don't need to add anything else. A CAUTION: 6-21