Patent ID: 6825154
Filing Date: 2004-11-30
Classification: C10M,C10N

Abstract:
A lubricating oil of reduced crystal formation potential wherein the crystal formation is attributable to the interaction of sulfur-phosphorus containing anti-wear/extreme pressure agents and hindered phenolic antioxidants, the lubricating oil comprising a major amount of a base oil of lubricating viscosity and having less than about 99 wt % saturates content, and a minor amount of additive comprising a sulfur-phosphorus containing anti-wear/extreme pressure additive of the type which will interact with hindered phenol antioxidant to produce crystals, a hindered phenol antioxidant and a high molecular weight di- or poly-carboxylic acid, anhydride or mixture thereof provided at least 0.0013 wt % high molecular weight di- or poly-carboxylic acid, anhydride or mixture thereof is present for each 1 ppm phosphorus attributable to the sulfur-phosphorus containing anti-wear/extreme pressure agent.