Oxidation inhibitors, commonly added to inhibited mineral oils, slow the chemical reactions that create acids and sludge. By reducing oxidation rate, the inhibitor helps maintain low acidity, stable interfacial tension, and good dielectric performance for longer periods, which supports cooling and insulation reliability. Inhibitor level can decline over time due to consumption and oil processing, so some maintenance programs test inhibitor content and decide whether re inhibition is justified. Inhibited oils are often preferred where high temperature operation or long service intervals are expected, but compatibility with utility specifications must be confirmed.
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