US 2025/0354082 A1 · LUBRICATING COMPOSITION AND METHOD OF LUBRICATING AN INTERNAL COMBUSTION ENGINE

Abstract

The disclosed technology relates to lubricants for compression ignition internal combustion engines, particularly those demonstrating at least one of improved seals performance, reduced deposit formation, and excellent durability. The present invention provides a low zinc lubricating composition comprising (a) an oil of lubricating viscosity, (b) a borated dispersant, and (c) a metal-free organo-phosphorus anti-wear additive, wherein the lubricating composition is substantially free of a metal containing sulfur coupled alkyl phenol compound. Further, the low zinc lubricating composition contains zinc in an amount less than 600 ppm by weight of the composition.

Claims40

Dependent claims

A composition for lubricating an internal combustion engine comprising:

an oil of lubricating viscosity;
and
a DMTD derivative comprising the reaction product of 2,5-dimercapto-1,3,4-thiadiazole (“DMTD”) and an α, β-unsaturated carbonyl compound.

Dependencies are inferred from the claim text.

Facts

Application

18/873,462Filed 21 Jun 2023

Priority

27 Jun 2022

Published

20 Nov 2025

Term ends

Not estimatedThe source records don’t support an estimate.

Classification21 codes

C10M 135/36
Heterocyclic sulfur, selenium or tellurium compounds: the ring containing sulfur and carbon with nitrogen or oxygen
C10M 125/22
Lubricating compositions characterised by the additive being an inorganic material: compounds containing sulfur, selenium or tellurium
C10M 2207/028
Having hydroxy groups bound to carbon atoms of six-membered aromatic rings: overbased salts thereof
C10M 2207/262
Overbased carboxylic acid salts: derived from hydroxy substituted aromatic acids, e.g. salicylates

Lubricating composition and method of lubricating an internal combustion engine

Life of this patent

Lubricating composition and method of lubricating an internal combustion engine

Life of this patent

Abstract

Claims40