MANUAL TRANSMISSION FLUID MADE WITH LUBRICATING BASE OIL HAVING HIGH MONOCYCLOPARAFFINS AND LOW MULTICYCLOPARAFFINS

摘要

A manual transmission fluid having a Vl greater than 160 and a Brookfield viscosity at -400ºC less than 30,000 cP. It comprises: 1) a base oil (made from a waxy feed) having less than 0.06 wt% aromatics, greater than 5 wt% total molecules with cycloparaffinic functionality, and a ratio of molecules with monocycloparaffinic functionality to molecules with multicycloparaffinic functionality greater than 20; and a manual transmission fluid additive package. In another embodiment, the manual transmission fluid comprises: 1) a base oil having a high Vl and a kinematic viscosity at 1000ºC greater than 5.5 cSt, 2) less than 0.01 wt% pour point depressant, and 3) a manual transmission fluid additive package. This invention is also directed to a process to make the manual transmission fluid, comprising the steps of hydroisomerization dewaxing, selecting base oil fractions having a high Vl, and blending the fractions with an additive package.