Chevron U.s.a. Inc.

Wanderley Carreira Souza, Jr

Rebecca Elizabeth Brafman

Alex Beringuy Souza

Luiz Fernando Feijo Lemos

Gerson Vieira Baeta Neves

Matthew Hussain Ansari

Disclosed herein is a multigrade engine oil with excellent low temperature viscometric properties, including improved mini-rotary viscometer (MRV) results. In one embodiment, the multigrade engine oil comprises a major amount of a first lubricating base oil having a MRV viscosity at a test temperature from about &#x2212;25&#xb0; C. to about &#x2212;40&#xb0; C. of greater than 60,000 cP and a MRV yield stress at the test temperature of greater than zero; a second lubricating base oil having a MRV viscosity at the test temperature of 60,000 cP of less and no MRV yield stress at the test temperature; and a pour point depressant. The multigrade engine oil has a MRV viscosity at the test temperature of 60,000 cP or less and no MRV yield stress at the test temperature. Since the first lubricating base oil is present in a major amount, the first lubricating base oil is present in an amount greater than any other component of the multigrade engine oil, including the amount of the second lubricating base oil. Also disclosed herein is a process for preparing a multigrade engine oil with excellent low temperature viscometric properties, including improved MRV results.

Mulitigrade engine oil with improved mini-rotary viscometer results and process for preparing the same

A process for improving MRV performance and decreasing wax crystallization in a lubricating oil, comprising: replacing between about 5 to 60 wt % of a base oil or base oil blend with between about 5 to 60 wt % of a Group II base oil. A resultant multigrade engine oil affords a Mini-Rotary Viscosity (MRV) at &#x2212;30&#xb0; C. of less than 60,000 mPa&#xb7;s with no yield stress. The multigrade engine oil, comprising: (a) between about 10 to 30 wt % of a Group II base oil and (b) between about 40 to 60 wt % of a Group I paraffinic base oil characterized by: (i) a VI from about 98 to 104, and (ii) a kinematic viscosity from about 4.5 to 5.5 cSt at 100&#xb0; C., and (c) an additive package.

Multi-grade engine oil formulations with improved mini-rotary viscometer results

Base oil blend upgrading process with a group II base oil to yield improved mini-rotary viscometer results

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Rio de Janeiro, Brazil

Wanderley Carreira Souza, Jr