Lubricating oil formulations
AssigneeEthyl Corporation
InventorsNubar Ozbalik, Sanjay Srinivasan, Vincent James Gatto
Life of this patent
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Abstract
Lubricating oil compositions having excellent thermal and oxidative stability, wear control, copper corrosion control and compatibility with seal materials comprising a mineral oil having a) a Viscosity Index of greater than 110 and an aniline point of greater than 110.degree. C. and/or b) a linear+single ring paraffin content of greater than 68 wt %, and at least one polymer selected from olefin (co) polymer(s), polyalkyl (meth) acrylate(s) and mixtures thereof. The lubricating oil compositions are particularly useful as manual transmission and axle lubricants.
Claims50
A lubricating oil composition comprising:
- (A) a mineral oil having a Viscosity Index of greater than 110, an aniline point of greater than 110.degree. C. and a linear+single ring, paraffin content of 68% or greater;
- (B) from about 0.1 to about 40 weight percent, based on the total weight of the lubricating oil composition, of at least one polymer selected from the group consisting of olefin (co) polymer(s), polyalkyl (meth) acrylate(s) and mixtures thereof;
- (C) from 2 to 25 weight percent, based on the total weight of the lubricating oil composition, of a detergent/inhibitor package.
A method of lubricating a manual transmission, said method comprises introducing into a manual transmission a lubricating oil composition comprising:
- (A) From 40 to 93 weight percent of a mineral oil having a Viscosity Index of greater than 110;
- an aniline point of greater than 110.degree. C. and a linear+single ring paraffin content of 68% or greater;
- (B) from about 0.1 to about 40 weight percent, based on the total weight of the lubricating oil composition, of at least one polymer selected from the group consisting of olefin (co) polymer(s), polyalkyl (meth) acrylate(s) and mixtures thereof;
- and
- (C) from 2 to 25 weight percent, based on the total weight of the lubricating oil composition, of a detergent/inhibitor package, wherein the detergent/inhibitor package provides 0.2 to 5 wt % dispersant(s), 0 to 1.0 wt % antioxidant(s) and 0.01 to 2 wt % inhibitor(s) to the finished lubricating oil.
The method according to claim 27 wherein (b') and (b") are present in a ratio of b':b" of from 20:1 to 1:2.
A method of lubricating a vehicle axle, said method comprises introducing into the axle of a vehicle a lubricating oil composition comprising:
- (A) from 40 to 93 weight percent of a mineral oil having a Viscosity Index of greater than 110, an aniline point of greater than 110.degree. C. and a linear+single ring paraffin content of 68% or greater;
- (B) from about 0.1 to about 40 weight percent, based on the total weight of the lubricating oil composition, of at least one polymer selected from the group consisting of olefin (co) polymer(s), polyalkyl (meth) acrylate(s) and mixtures thereof;
- and
- (C) from 2 to 25 weight percent, based on the total weight of the lubricating oil composition, of a detergent/inhibitor package, wherein the detergent/inhibitor package provides 3-15 wt % sulfur containing extreme pressure agent(s), 2-10 wt % phosphorus containing anti-wear agent(s), 0.2-5 wt % dispersant(s) and 0.01-2 wt % inhibitor(s) to the finished lubricating oil.
Dependencies are inferred from the claim text.