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Reply to "Gear and Hyd oil TBN?"

The severity of the typical engine oils operation with combustion/explosion/temperature and pressure and Sulphur in fuels that it demands a countering through an anti-acid package or alkalinity known as TBN.

In comparison, the severity in Hydraulic and Gear Oils can be met through treatment with oxidation inhibitors. hence, TBN package is largely uncalled for, due to lesser severity.
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