| 摘要 |
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.
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