Improvements in or relating to lubricating compositions

Amine fluoborates of formula RxABF4, where R is an amine and x is 1 or more, are prepared by interaction of an amine with a fluoborate such as ammonium fluoborate. Amines mentioned are aniline, diethylene triamine, 3-di-n-amylaminepropylamine, monoethanolamine, phenylethanolamine, aminoethylethanolamine and nitron (1,4-diphenyl-3,5-endoanilino-4,5-dihydro-1,2,4-triazole).ALSO:A lubricating composition comprises a major proportion of hydrocarbon oil and a minor proportion of a fluoborate RxHBF4, where R is an amine and x may be 1 or more. The hydrocarbon oil may be of natural or synthetic origin. Fluoborates mentioned are those of diethylene triamine, nitron, aniline, aminoethylethanolamine, 3 - di - n - amylaminopropylamine, monoethanolamine and phenylethanolamine. From 0.5 to 5 per cent of the fluoborate is preferably used. Additives, such as extreme pressure additives composed of chlorine-, sulphur- or lead-containing compounds, may also be added.