Oil Additives and Lubricating Greases

Certain oil additives are produced by reacting hydrated limes with alkyl phenates or organic sulfonates. The resulting calcium soaps act as wear inhibitors, help to prevent sludge build-up and neutralise acidity from products of combustion. 

Lubricating greases frequently contain 10 to 25 % of calcium soaps dispersed in naphthenic or aromatic mineral oils. While greases containing simple soaps are only suitable for use at temperatures up to 60 °C, complex soaps can be used at up to 160 °C [32.50]. 

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