Ashless Machine Oil

A process for making an ashless hydraulic fluid or paper machine oil comprising,

a) hydroisomerization dewaxing,
b) fractionating,
c) selecting a fraction having a very high VI, and a high level of molecules with cycloparaffinic functionality,
d) blending the fraction with an ashless antioxidant.

A process for making ashless paper machine oil, comprising:

a. selecting two lubricating base oils both having a consecutive number of carbon atoms, greater than 35 wt % total molecules with cycloparaffinic functionality, and a viscosity index greater than 150;

b. blending the two lubricating base oils with an ashless antioxidant additive concentrate and no viscosity index improver to make an ashless paper machine oil; wherein the ashless paper machine oil has a result of greater than 680 minutes in the rotary pressure vessel oxidation test.

Tags: Ashless Machine Oil