Ashless consumable engine oil

Abstract

The present invention relates to a low sulfur, low phosphorus, low-ash, zinc free consumable lubricant composition suitable for use in an internal combustion engine, comprising: an oil of lubricating viscosity containing less than 0.01 percent by weight of sulfur; a high TBN succinimide dispersant and overall all lubricant composition that has a sulfated ash value of up to about 0.2, a phosphorus content of up to about 50 to about 800 ppm and a sulfur content of up to about 0.4 percent by weight.

Description

BACKGROUND OF THE INVENTION [0001] The present invention relates to a low sulfur, low phosphorus, low-ash consumable lubricant composition suitable for use in an internal combustion engine. [0002] Over the last twenty years, engine manufactures have achieved remarkable reductions in Particulate Matter (PM) emissions by significant modifications of their engines. One of the most innovative recent approaches includes the introduction of highly advanced, hydraulic or non-hydraulic, electromagnetic actuated electronic controls that eliminates mechanically driven camshafts. There is now a need to lubricate these new engines, while maintaining the reduction in PM emissions. The present invention of a low sulfur, low phosphorus, low-ash consumable lubricant fulfills these requirement. [0003] Another problem associated with internal combustion engines equipped with exhaust gas after-treatment devices (e.g., catalytic converters, particulate traps, catalyzed traps, etc.) is that the lubricat...

AI Technical Summary

Benefits of technology

[0081] The results illustrate the advantages of the inventive lubricant composition, which include providing a consumable lubricant which reduces deposit formation, decreases wear in the engine, lowers oil consumption and reduces the formation of particulate matter.

Problems solved by technology

Another problem associated with internal combustion engines equipped with exhaust gas after-treatment devices (e.g., catalytic converters, particulate traps, catalyzed traps, etc.) is that the lubricating oils for such engines are used in both the crankcase as well as in high wear areas such as the valve train.

During the operation of the engine these EP agents decompose and the resulting decomposition products eventually enter the aftertreatment device resulting in damage to the device.

The problem therefore is to provide a lubricating oil composition that avoids damaging the exhaust gas aftertreatment device.

Another problem associated with conventional internal combustion engines is that the time interval required between oil changes typically is less than the time interval required for other service items such as air filter replacements, coolant changes, brake replacements, and the like.

Oil changes are viewed as one of the most aggravating and, in some cases, most costly maintenance aspects of vehicle ownership.

The problem therefore is to improve the lubricant technology for these engines so that the time intervals between oil changes can be extended to coincide with other service intervals.

Another problem associated with the operation of internal combustion engines is that the exhaust gases from such engines contain NOx which is an undesirable pollutant.

Another problem associated with the operation of internal combustion engines is the disposal of conventional lubricating oils.

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