Lubricant composition comprising a bi-modal side-chain distribution LOFI

A method for formulating a lubricant composition formed from Group III base oils which satisfies the requirements of the MRV Pumpability Test according to ASTM D4684 comprising the following steps:

• blending at least the following components:
• (a) an API Group III base stock;
• (b) one or more semi-crystalline viscosity modifier;
• and
• (c) one or more dialkyl fumarate-vinyl acetate copolymer LOFIs having a side-chain distribution which satisfies the following requirements:
• (1) the distribution contains side chains ranging from C8 to C18 with an average carbon number ranging from 12.4 to 14.4;
• (2) the side chain distribution is bi-modal with a lower portion of the bi-modal distribution made up primarily of C12 and an upper portion of the distribution made up primarily of C16, C18 or combinations thereof;
• (3) the total mole % of the upper portion of the distribution is less than that of the lower portion of the distribution;
• and
• (4) the amount of C12 on the side chain is at least 40 mole % of the total side chain distribution;
• whereby the lubricant composition exhibits a viscosity equal to or less than 60,000 mPa·s and a yield stress of less than 35 Pa when subjected to an MRV Pumpability Test according to ASTM D4684.