Ability of a lubricant to separate from water.

The temperature at which a flocculent collection of wax crystals first appears when a solution of freon in oil is cooled under prescribed conditions.

Soft deposits, usually dark coloured, formed in lubrication systems, mainly consisting of oxidised lubricating oil components, water and, in internal combustion engines, carbonaceous residues from fuel combustion.

Lubricant additive, usually a high molecular weight polymer, that reduces an oil’s tendency to change viscosity with change of temperature.

A

Milligrams of KOH required in tests to neutralise all the acidic constituents present in a 1 gram sample of petroleum product. Also formerly called the Neutralisation Number, this property is often used to indicate the extent of contamination or oxidation of used oils.

Any material that is incorporated into a product at relatively low concentration to impart new properties or enhance existing properties.

The number of minutes for air entrained in oil to reduce the volume to 0.2% under the conditions of test and at the specified temperature.

The minimum temperature for complete miscibility of equal volumes of aniline and the sample under test. Products containing aromatics or naphthenes have lower aniline points than products containing paraffins.

Additive used to suppress the foaming tendency of petroleum products in service. May be a silicone oil to break up surface bubbles or a polymer to decrease the number of small entrained bubbles.