Process for making medium-speed diesel engine oil
AssigneeChevron U.S.A. Inc.
InventorsJohn M. Rosenbaum, Nancy K. Smrcka
Life of this patent
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Abstract
A process to make a lubricating oil, comprising: a) selecting a lubricating base oil, made from a waxy feed, having: i. less than 0.3 wt % aromatics, ii. greater than 10 wt % molecules having cycloparaffinic functionality, iii. a ratio of molecules with monocycloparaffinic functionality to molecules with multicycloparaffinic functionality greater than 15; and b) blending the lubricating base oil with an engine oil additive package formulated to protect silver bearings and less than 2.0 wt % viscosity index improver; wherein the lubricating oil has a cold cranking simulator viscosity at −15° C. less than 7000 cP, a GE HTHS (final) of at least 10.8 cP, and a TBN between 8 and 20.
Claims6
A process to make a lubricating oil, comprising:
- a) selecting a lubricating base oil, made from a waxy feed, having:
- i. less than 0.3 wt % aromatics,
- ii. greater than 10 wt % molecules having cycloparaffinic functionality,
- iii. a ratio of molecules with monocycloparaffinic functionality to molecules with multicycloparaffinic functionality greater than 15;
- and
- b) blending the lubricating base oil with an engine oil additive package formulated to protect silver bearings and less than 2.0 wt % viscosity index improver;
- wherein the lubricating oil has a cold cranking simulator viscosity at −15° C. less than 7000 cP, a GE HTHS (final) of at least 10.8 cP, and a TBN between 8 and 20.
Dependencies are inferred from the claim text.