Gear lubricant with low Brookfield ratio

A gear lubricant, comprising:

• a. greater than 10 wt % based on the total gear lubricant of a first base oil having:
• i. a sequential number of carbon atoms,
• ii. less than 0.06 wt % aromatics,
• iii. greater than 20 wt % total molecules with cycloparaffinic functionality, and
• iv. a ratio of molecules with monocycloparaffinic functionality to molecules wim multicycloparaffinic functionality greater than 12;
• b. less than 22 wt % based on the total gear lubricant of a second base oil having:
• i. a sequential number of carbon atoms,
• ii. less than 40 wt % total molecules with cycloparaffinic functionality,
• iii. a ratio of molecules with monocycloparaffinic functionality to molecules with multicydoparaffinic functionality less than 12;
• c. 0.05 to 15 wt % based on the total gear lubricant of a pour point depressing base oil blending component that is an isomerized Fischer-Tropsch derived, or petroleum derived, bottoms product;
• d. a pour point depressant;
• e. between 2.5 to 30 wt % based on the total gear lubricant of an EP gear lubricant additive;
• and
• f. less than 10 wt % based on the total gear lubricant of a viscosity index improver;
• wherein the gear lubricant has:
• i. a kinematic viscosity at 100° C. greater than 10 cSt,
• ii. a Brookfleld Ratio less than an amount defined by the equation:
• Brookfleld Ratio=613×e(0.07 ×β);
• and
• wherein β equals −40 when the gear lubricant is an SAE 75-XX, β=−26 when the gear lubricant is an SAE 80W-XX, and β=−12 when the gear lubricant is an SAE 85W-XX.

A gear lubricant, comprising:

• a. 0.05 to 15 wt % pour point depressing base oil blending component that is an isomerized Fischer-Tropsch derived, or petroleum derived, bottoms product,
• b. greater than 10 wt % based on the total gear lubricant of a first base oil, made from a first waxy feed, having less than 0.06 wt % aromatics and a viscosity index greater than an amount defined by the equation:
• VI=28×Ln(Kinematic Viscosity at 100° C.)+105;
• c. less than 22 wt % based on the total gear lubricant of a second base oil, made from a second waxy feed, having less than 0.06 wt % aromatics and a viscosity index less than an amount defined by the equation:
• VI=28×Ln(Kinematic Viscosity at 100° C.)+105:
• d. a pour point depressant;
• and
• e. between 2.5 to 30 wt % based on the total gear lubricant of an EP gear lubricant additive;
• wherein the gear lubricant has:
• i. a gear lubricant kinematic viscosity at 100° C. greater than 10 cSt, and
• ii. a Brookfield Ratio less than an amount defined by the equation:
• Brookfield Ratio=613×e(−0.07×β)
• and wherein β equals −40 when the gear lubricant is a SAE 75W-XX, β equals −26 when the gear lubricant is a SAE 80W-XX, and β equals −12 when the gear lubricant is a SAE 85W-XX.

A gear lubricant having a Brookfield Ratio less than an amount defined by the equation:

• Brookfield Ratio=613×e(−0.07×β);
• and
• wherein β equals −40 when the gear lubricant is an SAE 75W-XX, β equals −26 when the gear lubricant is an SAE 80W-XX, and β equals −12 when the gear lubricant is an SAE 85W-XX, comprising:
• a. between 10 and 95 wt % of a hydroisomerized distillate Fischer-Tropsch derived base oil characterized by (i) a kinematic viscosity between 2.5 and 8 cSt at 100° C., (ii) at least about 10 wt % of the molecules having cycloparaffinic functionality, and (iii) a ratio of weight percent molecules with monocycloparaffinic functionality to weight percent of molecules with multicycloparaffinic functionality greater than 5;
• b. 0.05 to 15 wt % of a pour point depressing base oil blending component prepared from an isomerized bottoms product having an average degree of branching in the molecules between about 5 and about 9 alkyl-branches per 100 carbon atoms;
• and
• c. between 2.5 to 30 wt % of an EP gear lubricant additive.

A process for making a gear lubricant, comprising:

• a. selecting a base oil, made from a waxy feed, having:
• i. less than 0.06 wt % aromatics,
• ii. greater than 20 wt % total molecules with cycloparaffinic functionality, and
• iii. a ratio of molecules with monocycloparaffinic functionality to molecules with multicycloparaffinic functionality greater than 12;
• and
• b. blending the base oil with:
• i. between 2.5 to 30 wt % based on the total gear lubricant of an EP gear lubricant additive,
• ii. optionally, a pour point depressing base oil blending component made from an isomerized bottoms product,
• iii. a pour point depressant, and
• iv. less than 10 wt %, based on the total gear lubricant, of a viscosity index improver to produce the gear lubricant;
• wherein the gear lubricant has a kinematic viscosity at 100° C. greater than 10 cSt, and a ratio of Brookfleld viscosity in cP, measured at temperature β in ° C., to the kinematic viscosity at 100° C. less than an amount defined bythe equation:
• Brookfleld Ratio=613×e(−0.07×β) and
• wherein β equals −40 when the gear lubricant is an SAE 75W-XX, β equals −26 when the gear lubricant is an SAE 80W-XX, and β equals −12 when the gear lubricant is an SAE 85W-XX.

A process for making a gear lubricant, comprising:

• a. selecting a first base oil, made from a waxy feed, having:
• (i) less than 0.06 wt % aromatics,
• (ii) greater than 20 wt % total molecules with cycloparaffinic functionality, and
• (iii) a ratio of molecules with monocycloparaffinic functionality to molecules with multicycloparaffinic functionality greater than 12;
• and
• b. blending the first base oil with:
• (i) greater than zero and less than 22 wt %, based on the total gear lubricant, of a second base oil, wherein the second base oil has:
• a. a sequential number of carbon atoms,
• b. less than 40 wt % total molecules with cycloparaffinic functionality,
• c. a ratio of molecules with monocycloparaffinic functionality to molecules with multicycloparaffinic functionality less than 12
• (ii) between 2.5 to 30 wt % based on the total gear lubricant of an EP gear lubricant additive,
• (iii) optionally, a pour point depressing base oil blending component made from an isomenzed bottoms product,
• (iv) a pour point depressant, and
• (v) less than 10 wt %, based on the total gear lubricant, of a viscosity index improver to produce the gear lubricant;
• wherein the gear lubricant has a kinematic viscosity at 100° C. greater than 10 cSt, and a ratio of Brookfield viscosity in cP, measured at temperature β in ° C., to the kinematic viscosity at 100° C. less than an amount defined by the equation:
• Brookfield Ratio=613×e(−0.07×β)
• and wherein β equals −40 when the gear lubricant is an SAE 75W-XX, β equals −26 when the gear lubricant is an SAE 80W-XX, and β equals −12 when the gear lubricant is an SAE 85W-XX.

A process for making a gear lubricant, comprising:

• a. selecting a base oil, made from a waxy feed, having a viscosity index greater than an amount defined by the equation:
• VI=28×Ln(Kinematic Viscosity at 100° C.)+105;
• b. blending the base oil with:
• (i) a pour point depressing base oil blending component prepared from an isomerized bottoms product having an average degree of branching in the molecules between about 5 and about 9 alkyl-branches per 100 carbon atoms,
• (ii) an EP gear lubricant additive,
• (iii) a pour point depressant, and
• (iv) less than 10 weight percent, based on the total gear lubncant, of a viscosity index improver to produce a gear lubricant;
• wherein the gear lubricant has a kinematic viscosity at 100° C. greater than 10 cSt, and a ratio of Brookfield viscosity in cP, measured at temperature β in ° C., to the kinematic viscosity at 100° less than an amount defined by the equation:
• Brookfleld Ratio=613×e(−0.07×β)
• and wherein β equals −40 when the gear lubricant is a SAE 75W-XX, β equals −26 when the gear lubricant is a SAE 80W-XX, and β equals −12 when the gear lubricant is a SAE 85W-XX.

A method for reducing a BrookField Ratio of a gear lubricant having a kinematic viscosity at 100° C. greater than 10 cSt, comprising adding between 0.5 to 10 wt % of the total gear lubricant of a pour point depressing base oil blending component having a pour point at least three degrees higher than a second pour point of an isomerized distillate fraction also present in the gear lubricant;

• wherein the Brookfield Ratio is:
• a. a ratio of the Brookfield viscosity of the gear lubricant in CP, measured at a temperature β in ° C., to a kinematic viscosity at 100° C. of the gear lubricant, and
• b. less than an amount defined by the equation:
• Brookfield Ratio=613×e(−0.07×β);
• and
• wherein β equals −40 when the gear lubricant is an SAE 75W-XX, β equals −26 when the gear lubricant is an SAE 80W-XX, and β equals −12 when the gear lubricant is an SAE 85W-XX.

A gear lubricant, comprising:

• a. greater than 25 wt % based on the total gear lubricant or a first base oil having:
• i. a sequential number of carbon atoms,
• ii. less than 0.06 wt % aromatics,
• iii. greater than 20 wt % total molecules with cycloparaffinic functionality, and
• iv. a ratio of molecules with monocycloparaffinic functionality to molecules with multicycloparaffinic functionality greater than 12;
• b. less than 22 wt % based on the total gear lubricant of a second base oil having:
• i. a sequential number of carbon atoms,
• ii. less than 40 wt % total molecules with cycloparaffinic functionality,
• iii. a ratio of molecules with monocycloparaffinic functionality to molecules with multicycloparaffinic functionality less than 12;
• c. a pour point depressant;
• d. between 2.5 to 30 wt % based on the total gear lubricant of an EP gear lubricant additive;
• and
• e. less than 10 wt % based on the total gear lubricant of a viscosity index improver;
• wherein the gear lubricant has:
• i. a kinematic viscosity at 100° C. greater than 10 cSt,
• ii. a Brookfield Ratio less than an amount defined by the equation:
• Brookfleld Ratio=613×e(0.07×β);
• and
• wherein β equals −40 when the gear lubricant is an SAE 75-XX, β=−26 when the gear lubricant is an SAE 80W-XX, and β=−12 when the gear lubricant is an SAE 85W-XX.