Emission of phosphorus-containing and phosphorus-free fully formulated crankcase oil using an engine dynamometer

Abstract

Emissions systems durability is influenced by many engine oil formulation variables. Previous studies have suggested that emissions system durability is optimized by a high metal/phosphorus ratio. Tn this work a systematic study was conducted to determine the effect of phosphorus and phosphorus-free additives in the lubricant on exhaust emissions using an engine dynamometer for 22 minutes. Within experimental accuracy, both phosphorus-free lubricant have shown satisfactory engine performance characteristics and similar HC emissions under identical engine test conditions. However, there might be a marginal improvement of carbon monoxide emission by phosphorus-free oils over the phosphorus-containing oils.