Infineum International Limited

Doyle Boese

Ricardo A Bloch

David J Martella

Jose A Gutierrez

Robert William Shaw

Andrew J D Ritchie

Christopher Gray

A method of preventing or reducing the occurrence of Low Speed Pre-Ignition (LSPI) in a direct-injected, boosted, spark-ignited internal combustion engine that, in operation, generates a break mean effective pressure level of greater than about 15 bar, at an engine speed of from about 1500 to about 2500 rotations per minute (rpm), in which the crankcase of the engine is lubricated with a lubricating oil composition containing at least about 0.2 mass % of magnesium sulfated ash.

Lubricating oil compositions

A lubricant composition is disclosed. The lubricant composition is made up of (a) an API Group III base stock; (b) one or more semi-crystalline viscosity modifier; and (c) one or more LOFIs having a side-chain distribution which satisfies the following requirements: (1) the distribution contains side chains ranging from Cto Cwith 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 Cand an upper portion of the distribution made up primarily of C, Cor combinations thereof; (3) the total mole % of the upper portion of the distribution must be less than that of the lower portion of the distribution; and (4) the amount of Con the side chain must be at least 40 mole % of the total side chain distribution.

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

An internal-combustion engine lubricating oil composition has a P content of not greater than 0.09 mass %; a S content of not greater than 0.3 mass %; and a sulphated ash content of not greater than 1 mass %. It contains the following additives: as sole ashless, nitrogen-containing dispersant, and providing from 0.03 to 0.07 mass % of nitrogen in the lubricating oil composition, at least one ashless, nitrogen-containing derivative of a polyalkenyl-substituted mono- or dicarboxylic acid, anhydride or ester, the polyalkenyl-substituted mono- or dicarboxylic acid, anhydride or ester being made from a polyalkene exclusively by the thermal 'ene' reaction; as sole overbased metal detergent, at least one overbased alkaline earth metal sulfonate; and at least one viscosity modifier.

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Plainfield, NJ, United States of America

Doyle Boese