1994 Buick LeSabre Owner's Manual - Page 231

Let the warning lights work as they should. What to Use Use a mixtureof one-half clean water (preferably ''GM distilled) and one-half antifreeze that meets 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, don't need to add you anything else. I NOTICE: If you use an improper coolant mix, your engine could overheat and badly damaged. The be repair cost wouldn't be covered by your warranty. Too much water in the mix can freeze and crack the engine, radiator, heater core and other parts. Adding Coolant