Concentrates containing specific functionalised diblock copolymers serve as effective additives for improving the cold flow behaviour of fuels and oils, the copolymers being derived from a terminally-unsaturated intermediate polymer obtained via a metallocene process involving hydrogen.

Concentrates containing specific functionalised diblock copolymers serve as effective additives for improving the cold flow behaviour of fuels and oils, the copolymers being derived from a terminally-unsaturated intermediate polymer obtained via a metallocene process involving hydrogen.

The invention provides a lubricant composition comprising an oil of lubricating viscosity and 0.01 wt % to 15 wt % of a (thio)phosphoric acid salt of an N-hydrocarbyl-substituted gamma-(-) or delta-amino(thio)ester. The invention further relates to a method of lubricating a mechanical device with the lubricant composition.

The invention provides a lubricant composition comprising an oil of lubricating viscosity and 0.01 wt % to 15 wt % of a (thio)phosphoric acid salt of an N-hydrocarbyl-substituted gamma-(-) or delta-amino(thio)ester. The invention further relates to a method of lubricating a mechanical device with the lubricant composition.

The invention provides a lubricant composition comprising an oil of lubricating viscosity and 0.01 wt % to 15 wt % of a protic acid salt of an N-hydrocarbyl-substituted gamma- (-) or delta- (-)amino(thio)ester. The invention further relates to a method of lubricating a mechanical device with the lubricant composition.

The invention provides a lubricant composition comprising an oil of lubricating viscosity and 0.01 wt % to 15 wt % of a protic acid salt of an N-hydrocarbyl-substituted gamma- (-) or delta- (-)amino(thio)ester. The invention further relates to a method of lubricating a mechanical device with the lubricant composition.