1994 Buick Roadmaster Owner's Manual - Page 242

Rear Axle When to Check and Change Lubricant Engine Coolant The following explains your cooling system and to how add coolant whenit is low. If you have a problem with Refer to the Maintenance Schedule to determine how engine overheating, see "Engine Overheating" the in often to check the lubricant and when to change it. See Index. "Periodic Maintenance Inspections" in the Index. The proper coolant for your Buick will: How to Check Lubricant If the level is below the bottomthe filler plug hole, of you'll need to add some lubricant. Add enough lubricant to raise the level tothe bottom of the filler plug hole. Give freezing protection downto -34°F (-37°C) Give boiling protection to 262O ( 128O C) . up F Protect against rust and corrosion. 0 . What to Use Standard Differential Use Axle Lubricant (GM Part 1052271) or SAE No. 8OW-90 GL-5 gear lubricant. Limited-Slip Differential To add lubricant when the level is low, Axle use Lubricant (GM Part No. 1052271) or S A E 8OW-90 GL-5 gear lubricant.To completely refill after draining, add 4 ounces (118 ml) of Limited-Slip Differential Lubricant Additive (GM Part No. 1052358). Then fill the bottom to with Pr of the filler plug hole Axle Lubricant (GMa t No. 1052271) or SAE8OW-90 GL-5 gear lubricant. Help keep the properengine temperature. Let the warning lights workas they should. What to Use Use a mixture one-half clean water (preferably of distilled) and one-half antifreeze 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.If you use this mixture,you don't needto add anything else. 240