Gas engine lubricating oil composition

Patent metadata

Field	Value
Publication number	US-10266785-B2
Application number	US-201414561261-A
Country	US
Kind code	B2
Filing date	Dec 5, 2014
Priority date	Dec 5, 2013
Publication date	Apr 23, 2019
Grant date	Apr 23, 2019

Abstract

A gas engine lubricating oil composition comprises an oil of lubricating viscosity including at least 90 mass % saturates and no more than 0.03 mass % to sulfur, a metal hydroxybenzoate detergent additive, a dispersant additive, and an aminic or phenolic antioxidant additive, and has a boron concentration, of zero or less than 90 ppm by mass, where boron, if present, is provided at least in part by a boron-containing dispersant additive. The composition exhibits improved lead corrosion properties and no adverse anti-wear properties.

First claim

What is claimed is:

1. A gas engine lubricating oil composition having TBN in the range of 4 to 20 mg KOH/g and an ash content of 0.2 to 0.6 mass %, as determined by ASTM D874, comprising, or made by admixing:
(A) an oil of lubricating viscosity including at least 90 mass % of saturates and no more than 0.03 mass % of sulfur in a major amount; and in respective minor amounts:
(B) a calcium salicylate detergent additive in an amount providing the lubricating oil composition with 0.08 to 0.16 mass % of calcium, expressed as atoms of Ca;
(C) succinimide dispersant additive in an amount providing the lubricating oil composition with 0.2 to 0.8 mass % of nitrogen; and
(D) 0.1 to 3 mass % of an aminic or phenolic antioxidant, the composition having a boron concentration of from 10 ppm to less than 90 ppm by mass; wherein said boron is provided at least in part by a boron-containing dispersant additive (C).

2. The composition of claim 1 wherein the boron concentration is in the range of 10 to 60 ppm by mass.

3. The composition of claim 1 , wherein all the boron is provided by a boron-containing dispersant additive (C).

4. The composition of claim 1 , further including, as co-additives (in addition to (B), (C) and (D)), in respective minor amounts, one or more dispersants, detergents, anti-wear additives, anti-oxidants, and corrosion inhibitors.

5. A method of lubricating a gas engine comprising the step of operating the engine while lubricating said engine with the gas engine lubricating oil composition of claim 1 .

Assignees

• Infineum Int Ltd

Inventors

• Dodd James C

Classifications

• C10N2010/04

  Groups 2 or 12 · CPC title

• C10N2040/255

  Gasoline engines · CPC title

• C10N2030/06

  Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure · CPC title

• C10N2060/14

  by boron or a compound containing boron · CPC title

• C10N2020/04

  Molecular weight; Molecular weight distribution · CPC title