Patent ID: 6720293
Filing Date: 2004-04-13
Classification: C10M,C10N

Abstract:
A low viscosity lubricating oil composition having a CCS viscosity less than 3500 mPa.s at âˆ’25Â° C. and a sulfated ash value of up to 2.0 mass %, based on the mass of the oil composition, which composition comprises an admixture of:(a) 1 to 10 mass % of a dispersant, based on the mass of the oil composition; (b) 0.05 to 0.60 mass % of elemental calcium or 0.05 to 0.30 mass % of elemental magnesium or both the calcium and magnesium in the corresponding amounts, based on the mass of the oil composition, wherein the calcium or magnesium or both calcium and magnesium are derived from one or more detergents; (c) 0 to 0.16 mass %, based on the mass of the oil composition, of phosphorus; (d) 0 to 5 mass % of an antioxidant, based on the mass of the oil composition; (e) 0 to 2 mass % of a pour depressant, based on the mass of the oil composition; (f) 0 to 2 mass % of a viscosity modifier, expressed as solid polymer, based on the mass of the oil composition; and (g) the balance a lubricating oil basestock selected from the group consisting of Group I, II, III, IV, V basestocks and any mixture thereof, with the proviso that when all the components selected from (a) to (g), which exhibit Newtonian behaviour, are admixed together, the base blend viscosity of the resulting admixture or composition is at least 8.2 mm2sâˆ’1 at 100Â° C.