Molybdenum-free low volatility lubricating oil composition
AssigneeInfineum International Limited
InventorsMalcolm Waddoups, Rolfe J. Hartley, Taisuke Miyoshi
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Abstract
A molybdenum-free lubricating oil composition exhibiting improved fuel economy and fuel economy retention properties, which comprises: (a) a base stock oil compound of at least 50 wt. % mineral oil, the base stock oil having a viscosity of 4.0-5.5 mm2/s at 100° C., 95 wt. % or more saturates, 25 wt. % or less napthenics, a NOACK volatility of 15.9% or less, a kV of 4.0-5.5 mm2/s at 100° C. and a viscosity index of at least 120; (b) at least one calcium detergent and (c) at least one organic friction modifier, wherein the composition has a NOACK volatility of about 15 wt. % or less and contains from about 0.058 to 0.58 wt. % calcium from the calcium detergent.
Claims9
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 mm2/s at 100° 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.
Dependencies are inferred from the claim text.