What is the impact of oxidation inside a heat transfer fluid circuit?

Fluid oxidation:
The oxidation of a heat transfer fluid can considerably shorten its life expectancy; the reaction requires air and temperature to take place so these two factors need to be adjusted to minimize their effects. The place where fluid can come into contact with air is the expansion tank. Working on this equipment to limit any contact between air and heating oil must be considered.
We recommend installing the following devices:

• Put the expansion tank under a nitrogen blanket or place a floating lid on the surface of the oil.
• Maintain the oil temperature below 55°C/60°C; this can be done by cooling the pipe connecting the expansion tank to the remainder of the circuit.
• The expansion tank must be in a ventilated place whenever possible.