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Lubricant compositions

  • US 5,700,764 A
  • Filed: 05/08/1996
  • Issued: 12/23/1997
  • Est. Priority Date: 05/22/1995
  • Status: Expired due to Term
First Claim
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1. A method of inhibiting pitting and enhancing tooth life of gears in a gear box or axle of a vehicle which comprises introducing into the gear box or axle a gear oil comprising at least one oil of lubricating viscosity and at least the following additive components:

  • a) at least one oil-soluble, metal-free, sulfur-containing antiwear and/or extreme pressure agent having a copper corrosion test activity of not more than 65, wherein the gear oil contains from 0.6 to 3.0 wt % of sulfur;

    b) at least one oil-soluble metal free, phosphorus-and nitrogen-containing antiwear and/or extreme pressure agent, wherein the gear oil contains from 0.04 to 0.25 wt % of phosphorus;

    c) from 0.07 to 0.50 wt % of at least one oil-soluble organic carboxylic acid; and

    d) from 0.2 to 0.8 wt % of at least one oil-soluble organic amine, and keeping that gear oil therein as the gear lubricant therefor for the period of service recommended or specified by the manufacturer of the vehicle.

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