Patent ID: 6333298
Filing Date: 2001-12-25
Classification: C10M,C10N

Abstract:
A lubricating oil composition for internal combustion engines which exhibits improved fuel economy and fuel economy retention properties, is free of molybdenum additives, has a NOACK volatility of 15 wt. % or less and which comprises:(a) a major amount of a base stock oil which is at least 50 wt. % mineral oil and said base stock oil has a kinematic viscosity of 4.0 to 5.5 mm.sup.2 /s at 100.degree. C., 95 wt. % or more saturates, 25 wt. % or less napthenics, a viscosity index of at least 120 and a NOACK volatility of 15.5 wt. % or less;(b) a calcium sulfonate detergent present in such amounts so as to provide 0.058 to 0.58 wt. % calcium in the composition; and(c) 0.02 to 2.0 wt. % of an oil soluble organic friction modifier.