Tractor hydraulic fluid

  • US 5,888,946 A
  • Filed: 12/30/1997
  • Issued: 03/30/1999
  • Est. Priority Date: 12/30/1997
  • Status: Expired due to Term
First Claim
Patent Images

1. A lubricating composition comprising:

  • (a) a major amount of a base oil mixture comprising;

    (1) a first high viscosity index mineral oil having a kinematic viscosity at 100°

    C. of at least about 4.0 centistokes; and

    (2) a second high viscosity index mineral oil having a kinematic viscosity at 100°

    C. of at least about 7.0 centistokes;

    (b) a first polymethacrylate polymer;

    (c) a second polymethacrylate polymer;

    (d) a performance additive package; and

    (e) wherein said lubricating composition has;

    (1) an unsheared kinematic viscosity at 100°

    C. of at least about 9.1 centistokes;

    (2) a sheared kinematic viscosity at 100°

    C. of at least about 7.1 centistokes; and

    (3) a Brookfield viscosity at -40°

    C. of no greater than about 20,000 centipoise.

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