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AssigneeShell Oil Company
InventorsAlexander Mark Robert James HELLAWELL, Robert WILKINSON, Alexander Peter Dirk MASSELY, Robert MOIR, Stuart BROWNING, Richard Thomas BOWN, Sravani GULLAPALLI
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Lubricating composition comprising (i) base oil and (ii) a Verkade base compound having the formula (1): wherein R1, R2 and R3 are each independently selected from hydrogen and saturated or unsaturated, straight chain or branched, C1-C22 alkyl groups. The lubricating composition of the present invention exhibits improved base number retention and oxidative stability, particularly in the presence of a biofuel such as fatty acid alkyl ester.
A lubricating composition comprising (i) base oil and (ii) compound having the formula (1):
(canceled)
A method for improving the base number retention of a lubricating oil composition, particularly of a lubricating oil composition which is used for lubricating the crankcase of an internal combustion engine which is fuelled with a biofuel composition, preferably wherein the biofuel composition is a biodiesel composition comprising a fatty acid alkyl ester, wherein the method comprises adding to the lubricating oil composition a compound of formula (1):
Dependencies are inferred from the claim text.