Exxonmobil Research and Engineering Company

Kathy K Cooper

Suzzy C Ho

Gary Christensen

A method for improving thermo-oxidative stability and elastomer compatibility in an apparatus lubricated with a lubricating oil by using as the lubricating oil a formulated oil including a lubricating oil base stock. The lubricating oil base stock includes a multi-aromatic base stock of the formula:R&#x2014;R&#x2014;(X&#x2014;R)&#x2014;Rwherein each Ris the same or different and is a terminal group, each Ris the same or different and represents a substituted or unsubstituted aromatic moiety; each X is a linking moiety that is carbon-carbon single bond or a linking group, n is a number from 1 to 2000, and the ratio of the total number of aromatic ring carbon atoms to aliphatic carbon atoms in said formula is greater than 0.32:1. The multi-aromatic base stock has a kinematic viscosity greater than 20 mm/s at 100&#xb0; C.

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South River, NJ, United States of America

Kathy K Cooper