About long-life anti-freeze problems, which statement is correct?

• A. It can produce silicate drop-out
• B. It is not compatible with all cooling system materials
• C. Both A and B
• D. Neither A nor B

Answer: (B)

Long-life antifreeze formulations are designed to protect a wide range of metals and seals, often using organic acids, and they are typically silicate-free to prevent deposits. That means they generally don’t cause silicate drop-out. However, no single coolant works with every material found in every cooling system—some gaskets, elastomers, or plastics may react differently to these additives. So the accurate statement is that long-life antifreeze is not compatible with all cooling system materials.