Mulitigrade Engine Oil with Improved Mini-Rotary Viscometer Results and Process for Preparing the Same

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 −25° C. to about −40° 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.