| abstract |
A lubricating composition containing the reaction product (a) of an aldehyde, amine and a di-secondary alkyl hindered phenol and at least one additive selected from the group consisting of hydrocarbyl diphenylamines, sterically hindered phenols other than component (a), metal hydrocarbyl dithiophasphates, sulphurised olefins and mixtures thereof. The composition has antioxidant properties for internal combustion engines without the bioaccumulation of tristert-butyl phenol. |