The economics of liquid cooling rarely remain confined to the equipment specification once a data center begins operating. A cooling fluid enters the system with documented thermal properties, dielectric characteristics, chemical stability, and compatibility claims, but its behavior gradually becomes inseparable from the conditions surrounding its operation. Heat exposure, oxygen contact, contamination, component interactions, and maintenance practices collectively influence how that fluid performs long after commissioning. This creates an important complication for the growing immersion cooling market, where synthetic formulations increasingly compete with mineral oils and fluorocarbon-based alternatives on the strength of their initial technical specifications. The published research increasingly examines both heat-transfer performance and the chemical stability of dielectric fluids, although direct evidence connecting laboratory aging results with long-term operating behavior across commercial immersion installations remains limited.