Infineum International Limited

Infineum USA LP

Nancy Z Diggs

Jacob I Emert

Antonio Gutierrez

Ricardo A Bloch

David J Martella

Mark G Stevens

Michael L Alessi

Rolfe J Hartley

Tushar Kanti Bera

Jose A Gutierrez

Matthew David Irving

Nigel A Male

Stephen Arrowsmith

Andrew J D Ritchie

Jun Hua

Benjamin R Elvidge

Fredrick W Girshick

Neal J Milne

Fredrick W Girschick

Jorge O Pain

Nigel Anthony Male

Neal James Milne

Benjamin Robert Elvidge

Jorge Osvaldo Pain

Robin Scott

Michael Louis Alessi

Jose Gutierrez

Michael Alessi

Andrew JD Ritchie

José A Gutiérrez

The present invention relates to lubricating oil compositions comprising sulfurised esters that exhibit good antioxidancy performance whilst maintaining nitrile elastomer seal compatibility

Lubricating oil composition

A lubricating oil composition, more specifically a lubricating oil composition for heavy duty diesel (HDD) engines having a sulfated ash content of no greater than 1.0 mass %, such as from about 0.7 to 1.0 mass %, a sulfur content of no greater than 0.4 mass %, and a phosphorus content of no greater than 0.12 mass % (1200 ppm), such as from about 0.08 to 0.12 mass %; and a TBN of from about 7 to about 15, which lubricating oil composition includes a major amount of oil of lubricating viscosity, at least about 0.5 mass % of an ashless antioxidant selected from sulfur-free phenolic antioxidants, aminic antioxidants, and mixtures thereof, and a minor amount of overbased metal detergent, wherein at least about 60% of the TBN contributed to the lubricating oil composition by overbased detergent is contributed by overbased magnesium detergent.

Lubricating oil compositions

Linked aromatic compounds found to act as potent soot dispersants in lubricating oil compositions; lubricating oil compositions containing such soot dispersants and precursor compounds from which the soot dispersants are derived.

Soot dispersants and lubricating oil compositions containing same

Lubricating oil compositions providing superior soot dispersing characteristics, which contain a combination of a high molecular weight dispersant and a soot dispersant comprising a linked aromatic oligomer.

A lubricating oil composition having a total base number of at least about 8, comprising a major amount of oil of lubricating viscosity; an amount of one or more dihydrocarbyl dithiophosphate metal salt introducing into the lubricating oil composition no more than 0.06 wt. % of phosphorus; at least 1.2 wt. % of hindered phenol antioxidant; and boron, and/or a boron-containing compound or compounds in an amount providing the lubricating oil composition with at least 200 ppm by weight of boron, all weight percentages being based on the total weight of the lubricating oil composition.

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Westfield, NJ, United States of America

Nancy Z Diggs