1993 Buick Skylark Owner's Manual - Page 233

~~~x~~~~ of 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. Use GM Engine Coolant Supplement (sealer) with any complete coolant change. you use these, you If don't needto add anything else. warrantv. Too much water in the mix can freeze 1A n Adding Coolant CAUTION: I Adding only plain water to your cooling system can be dangerous. Plain water, or some other liquid likealcohol, can boil before the proper coolant mix will. Your vehicle's coolant warning system is set for the proper coolant mix. With plain water or the wrong mix, your engine could get too hot but you wouldn't get the overheat warning. Your engine could catch fire and you or others could be burned. Use 50150 mix of clean a water and a proper antifreeze. The surge tankis located on of the passenger's side the engine compartment. To Check Coolant: When .your engine is cold, the coolant level should be at "FULL COLD," or alittle higher.