Patent ID: 7825076
Filing Date: 2010-11-02
Classification: C10M,C10N,F01N

Abstract:
1. A method of reducing the number of nucleation mode particles in the emissions from a heavy duty diesel engine fitted with a catalyzed particulate trap, which is a continuously regenerating trap (CRT™) comprising both an oxidation catalyst and a particulate trap, which method comprises lubricating a heavy duty diesel engine with a lubricating oil consisting essentially of an anti-wear, anti-oxidant and corrosion-inhibiting lubricating oil having a low sulphur content of less than 0.4% by weight and comprising ZDDP and optionally at least one additional additive selected from the group consisting of an anti-wear additive, an anti-oxidant additive, a corrosion inhibitor, an anti-foam additive, a Viscosity Index improver and a dispersant, wherein ZDDP is present at a concentration of up to 0.4 percent by weight, and employing a fuel having a low sulphur content of below 50 ppm by weight, to thereby reduce the emissions of nucleation mode particles from the heavy duty diesel engine fitted with a catalyzed particulate trap, wherein the nucleation mode particles have a diameter in the range of between about 3 nm and 7nm.