Crankcase lubricant compositions and method of improving engine

Details Crankcase lubricant compositions and method of improving engine Crankcase lubricant compositions and method of improving engine

1997-11-21

1998-09-08

Howard, Jacqueline V.

Solid anti-friction devices, materials therefor, lubricant or se

Lubricants or separants for moving solid surfaces and...

Organic sulfur compound, wherein the sulfur is single bonded...

508391, 508460, C10N15920

Patent

active

058045376

ABSTRACT:
A low phosphorus passenger car motor oil containing an oil of lubricating viscosity as the major component and a tri-metal detergent mixture as a minor component, wherein the tri-metal detergent mixture comprises at least one calcium overbased metal detergent, at least one magnesium overbased metal detergent and at least one sodium overbased metal detergent, wherein the tri-metal detergent mixture is present in the oil composition in an amount such that the total TBN contributed to the oil composition by the tri-metal detergent mixture is from about 2 to about 12, and wherein the calcium overbased detergent contributes from about 8 to about 42% of the total TBN contributed by the tri-metal detergent mixture, the magnesium overbased detergent contributes from about 29 to about 60% of the total TBN contributed by the tri-metal detergent mixture, and the sodium overbased detergent contributes from about 15 to about 64% of the total TBN contributed by the tri-metal detergent mixture.

REFERENCES:
patent: 3793201 (1974-02-01), Karn
patent: 4283294 (1981-08-01), Clarke
patent: 5071576 (1991-12-01), Vernet et al.
patent: 5232614 (1993-08-01), Colcborgh et al.
patent: 5256322 (1993-10-01), Cohen
patent: 5328620 (1994-07-01), Ripple
patent: 5726133 (1998-03-01), Blakey et al.

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