| abstract |
Lubricating composition comprising (i) base oil and (ii) a Verkade base compound having the formula (1): wherein R 1 , R 2 and R 3 are each independently selected from hydrogen and saturated or unsaturated, straight chain or branched, C 1 -C 22 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. |