Chevron U.s.a. Inc.

Thomas Plaetinck

John Michael Rosenbaum

Marc J De Weerdt

Stephen Joseph Miller

Mark Louis Sztenderowicz

Chantal R Swartele

Nancy J Bertrand

A process to make a shock absorber fluid having improved performance properties, the properties including an air release after 1 minute by DIN 51381 of less than 0.8 vol %, a kinematic viscosity at 100&#xb0; C. less than 5 mm/s and an aniline point greater than or equal to 95&#xb0; C., or meeting the specifications for Kayaba 0304-050-0002 or VW TL 731 class A. The shock absorber fluid is made by blending a base oil having less than 10 wt % naphthenic carbon and a high viscosity index with low levels of (or no) viscosity index improver and pour point depressant.

Process for making shock absorber fluid

A functional fluid comprising a base oil with a high viscosity index, wherein the functional fluid has a kinematic viscosity at 100&#xb0; C. between 2.5 and 5.0 mm/s, a low Brookfield viscosity, a high aniline point, and excellent air release. Shock absorber fluids with improved performance, comprising a particular base oil, wherein the improved performance includes high viscosity index, low Brookfield viscosity, high aniline point, excellent air release and high flash point.

Functional fluid compositions

A manual transmission fluid having a VI greater than 160 and a Brookfield viscosity at &#x2212;40&#xb0; C. 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 VI and a kinematic viscosity at 100&#xb0; C. 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 VI, and blending the fractions with an additive package.

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Zomergem, Belgium

Thomas Plaetinck