MARINE CYLINDER OILS CONTAINING HIGH VISCOSITY DETERGENTS

摘要

Marine cylinder oils require a relatively high viscosity, and therefore generally include substantial amounts of an albeit costly high viscosity lubricating oil of at least about 2000 to 4000 SUS at 100 DEG F. The use of overbased detergents with viscosities of at least about 180 cST at 100 DEG C, such as high viscosity overbased calcium sulfonates and phenates, was found to reduce the need for substantial amounts of the high viscosity lubricating oil and still achieve the desired finished marine cylinder oil viscosity. The weight percent of the high viscosity oil in the marine cylinder oil is inversely commensurately proportional to the viscosities of the detergent and lubricating oil for a predetermined marine cylinder oil viscosity. The present invention provides a marine cylinder oil with a viscosity of at least about 15 to 25 cST at 100 DEG C, with reductions of more than about 12 % to 16 % or more by weight of the costly high viscosity or bright stock oil by the use of high viscosity detergents.