What is a common issue with long-life anti-freeze according to Technician B?

The correct answer identifies a significant concern regarding long-life anti-freeze regarding its compatibility with various cooling system materials. Long-life anti-freeze formulations often contain organic acid technology (OAT), which can be beneficial in extending service intervals but may not be compatible with all metals and gaskets used in older or certain types of cooling systems.

This incompatibility may lead to corrosion or degradation of system components, resulting in leaks or reduced efficacy of the coolant over time. Therefore, understanding the specific materials used in a vehicle's cooling system is crucial for technicians when recommending and using anti-freeze types.

While considerations of cost, effectiveness, and lifespan are important, they do not specifically highlight the compatibility issue central to Technician B's concerns, making the third choice the most relevant and pressing issue related to long-life anti-freeze.