BEFORE YOU OPERATE ENGINE COOLANT Engine Coolant Specifications Coolant (Closed Cooling System) Note: In the U.S., LLC is required for the warranty to be valid. NOTICE Always add LLC to soft water especially when operating in cold weather. Never use hard water. Water should be clean and free from sludge or particles. Without LLC, cooling performance will decrease due to scale and rust in the coolant system. Water alone may freeze and form ice; it expands approximately 9% in volume. Use the proper amount of coolant concentrate for the ambient temperature as specified by the LLC manufacturer. LLC concentration should be a minimum of 30% to a maximum of 60%.
Too much LLC will decrease the cooling efficiency. Excessive use of antifreeze also lowers the cooling efficiency of the engine. Never mix different types or brands of LLC, as a harmful sludge may form. Mixing different brands of antifreeze may cause chemical reactions, and may make the antifreeze useless or cause engine problems. Texaco Long Life Coolant (LLC), both standard and premixed, product code 7997 and 7998 Havoline Extended Life Antifreeze / Coolant, product code 7994 Following the manufacturer’s recommendations, use a proper LLC which will not have any adverse effects on the materials (cast iron, aluminum, copper, etc.) of the engine’s cooling system.
Always use the mixing ratios specified by the antifreeze manufacturer for the temperature range. 34 YM Series Operation Manual