Manual transmission fluid made with lubricating base oil having high monocycloparaffins and low multicycloparaffins

A manual transmission fluid, comprising:

• a. a base oil, having:
• i. a viscosity index greater than an amount defined by the equation:
• VI=28×Ln (Kinematic Viscosity at 100 degrees C.)+100;
• ii. a kinematic viscosity at 100 degrees C. greater than 5.5 cSt;
• b. less than 0.01 weight percent pour point depressant;
• and
• c. a manual transmission fluid additive package;
• wherein the manual transmission fluid has a viscosity index greater than 160 and a Brookfield viscosity at −40 degrees C. less than 30,000 cP.

A process for making a manual transmission fluid, comprising:

• a. producing a base oil by hydroisomerization dewaxing a waxy feed having:
• i. greater than 50 weight percent n-paraffins,
• ii. a weight ratio of molecules of at least 60 carbons to molecules of at least 30 carbons less than 0.18,
• iii. and a T90 boiling point between 660° F. (349° C.) and 1200° F. (649° C.);
• b. selecting one or more fractions of the base oil having a viscosity index greater than an amount defined by the equation:
• VI=28×Ln(Kinematic Viscosity at 100° C.)+100;
• c. blending the one or more fractions with a manual transmission fluid additive package to produce a manual transmission fluid having a VI greater than 160 and a Brookfield viscosity at −40° C. less than 30,000 cP.