Ashless anti-wear(AW) additives containing phosphorus can be used as partial or complete replacement of zinc dithiodialkylphosphate(ZDDP).In oils with low sulfated ash content(< 1.0%),this approach will allow a sig...Ashless anti-wear(AW) additives containing phosphorus can be used as partial or complete replacement of zinc dithiodialkylphosphate(ZDDP).In oils with low sulfated ash content(< 1.0%),this approach will allow a significant reduction of ash content and/or provide the formulator with more flexibility to use additional metallic detergents.Over the past 70 years or so,ZDDP has proven to be a very effective engine oil additive by helping to reduct oxidation,wear,and corrosion in service.In this paper,we will compare ZDDP-based lubricants with lubricants base on ashless,P-containing additive systems;we will describe the ashless chemistry investigated and discuss its contribution to wear performance in modern,low-SAPS(sulfated ash,phosphorus & sulfur) engine oils in various bench,rig and engine tests;we will also report on some work done to evaluate AW additive compatibility with modern three-way exhaust gas catalysts(TWC).展开更多
文摘Ashless anti-wear(AW) additives containing phosphorus can be used as partial or complete replacement of zinc dithiodialkylphosphate(ZDDP).In oils with low sulfated ash content(< 1.0%),this approach will allow a significant reduction of ash content and/or provide the formulator with more flexibility to use additional metallic detergents.Over the past 70 years or so,ZDDP has proven to be a very effective engine oil additive by helping to reduct oxidation,wear,and corrosion in service.In this paper,we will compare ZDDP-based lubricants with lubricants base on ashless,P-containing additive systems;we will describe the ashless chemistry investigated and discuss its contribution to wear performance in modern,low-SAPS(sulfated ash,phosphorus & sulfur) engine oils in various bench,rig and engine tests;we will also report on some work done to evaluate AW additive compatibility with modern three-way exhaust gas catalysts(TWC).
