Methods for providing steel-on-steel friction and/or steel-on-paper friction with lubricant compositions for power transmitting fluids

1. A method for increasing steel-on-steel friction and stabilizing steel-on-paper friction comprising:

providing a lubricating composition comprising a major amount of a base oil and an additive composition comprising:

(a) at least one first phosphorus- and boron-containing dispersant in an amount of about 20 wt % or more in the additive composition;

(b) at least one second boron-containing dispersant, free of phosphorus; and

(c) at least one metal-containing detergent, wherein the total amount of metal in the lubricating composition is at least about 549 ppm;

lubricating a transmission with the lubricating composition;

wherein the additive composition further comprises one or more of an antioxidant, an extreme pressure additive, a corrosion inhibitor, an antiwear additive, a metal deactivator, an antifoam agent, a viscosity index improver, a pour point depressant, an air entrainment additive, a metallic detergent, and a seal swell agent, and

wherein in the lubricating composition, the first dispersant is present in a concentration range of 1 to 5 wt %, the second dispersant is present in a concentration range of 2.00 to 5 wt % and the detergent is present in a concentration range of 0.15 to 5 wt % based on the total weight of the lubricating composition.

2. The method of claim 1 , wherein the first dispersant comprises a phosphorylated and boronated polyisobutylene succinimide, bis-succinimide, or mixture thereof.

3. The method of claim 2 , wherein the polyisobutylene has a weight average molecular weight of about 900.

4. The method of claim 1 , wherein the second dispersant comprises a boronated polyisobutylene succinimide, bis-succinimide, or mixture thereof.

5. The method of claim 4 , wherein the polyisobutylene has a weight average molecular weight of about 900 to about 1300.

6. The method of claim 1 , wherein the detergent comprises an overbased detergent.

7. The method of claim 1 , wherein the detergent comprises a sulfonate or a phenate.

8. The method of claim 1 , wherein the detergent comprises one or more of calcium sulfonate, magnesium sulfonate, sodium sulfonate, calcium phenate, and zinc phenate.

9. The method of claim 1 , wherein the detergent comprises a calcium sulfonate having about 1.5 wt % to about 20 wt % calcium.

10. The method of claim 9 , wherein the calcium sulfonate comprises a TBN of about 250 mgKOH/g to about 450 mgKOH/g.

11. The method of claim 1 , wherein the detergent comprises a calcium phenate having about 2.5 wt % to about 8.5 wt % calcium.

12. The method of claim 1 , wherein the detergent comprises a calcium phenate having a TBN of about 50 mgKOH/g to about 300 mgKOH/g.

13. The method of claim 1 , wherein the transmission comprises a transmission employing one or more of a slipping torque converter, a lock-up torque converter, a starting clutch and one or more shifting clutches.

14. The method of claim 13 , wherein the transmission comprises a belt-type, chain-type, or disk-type continuously variable transmission.

15. A method of increasing steel-on-steel friction comprising:

providing a transmission with a lubricating composition comprising a major amount of a base oil and an additive composition comprising:

(a) at least one first phosphorus- and boron-containing dispersant;

(b) at least one second boron-containing dispersant, free of phosphorus; and

(c) at least one metal-containing detergent, wherein the total amount of metal in the lubricating composition is at least about 549 ppm;

lubricating a transmission with the lubricating composition;

wherein the additive composition further comprises one or more of an antioxidant, an extreme pressure additive, a corrosion inhibitor, an antiwear additive, a metal deactivator, an antifoam agent, a viscosity index improver, a pour point depressant, an air entrainment additive, a metallic detergent, and a seal swell agent, and

wherein in the lubricating composition, the first dispersant is present in a concentration range of 1 to 5 wt %, the second dispersant is present in a concentration range of 2.00 to 5 wt % and the detergent is present in a concentration range of 0.15 to 5 wt % based on the total weight of the lubricating composition.

16. A method of improving anti-shudder comprising:

providing a transmission having shudder with a lubricating composition comprising a major amount of a base oil and an additive composition comprising:

(a) at least one first phosphorus- and boron-containing dispersant in an amount of;

(b) at least one second boron-containing dispersant, free of phosphorus; and

(c) at least one metal-containing detergent, wherein the total amount of metal in the lubricating composition is at least about 549 ppm;

lubricating a transmission with the lubricating composition;

wherein the additive composition further comprises one or more of an antioxidant, an extreme pressure additive, a corrosion inhibitor, an antiwear additive, a metal deactivator, an antifoam agent, a viscosity index improver, a pour point depressant, an air entrainment additive, a metallic detergent, and a seal swell agent, and

wherein in the lubricating composition, the first dispersant is present in a concentration range of 1 to 5 wt %, the second dispersant is present in a concentration range of 2.00 to 5 wt % and the detergent is present in a concentration range of 0.15 to 5 wt % based on the total weight of the lubricating composition.

17. A method of stabilizing steel-on-paper friction comprising:

providing a transmission with a lubricating composition comprising a major amount of a base oil and an additive composition comprising:

(a) at least one first phosphorus- and boron-containing dispersant in an amount of;

(b) at least one second boron-containing dispersant, free of phosphorus; and

(c) at least one metal-containing detergent, wherein the total amount of metal in the lubricating composition is at least about 549 ppm;

lubricating a transmission with the lubricating composition;

wherein the additive composition further comprises one or more of an antioxidant, an extreme pressure additive, a corrosion inhibitor, an antiwear additive, a metal deactivator, an antifoam agent, a viscosity index improver, a pour point depressant, an air entrainment additive, a metallic detergent, and a seal swell agent, and

wherein in the lubricating composition, the first dispersant is present in a concentration range of 1 to 5 wt %, the second dispersant is present in a concentration range of 2.00 to 5 wt % and the detergent is present in a concentration range of 0.15 to 5 wt % based on the total weight of the lubricating composition.

18. The method of claim 1 , wherein the lubricating composition has a steel-on-steel coefficient of friction μ (Mid Point) of greater than or equal to about 0.13 and wherein the lubricating composition has a steel-on-paper coefficient of friction μ 20 /μ 100 of less than or equal to about 1.0.

19. The method of claim 1 , wherein the total amount of phosphorus and boron present in the lubricating composition is at least about 708 ppm.

20. The method of claim 1 , wherein the total amount of phosphorus in the lubricating composition is at least about 300 ppm.