Evaluation of Some Lubrication Oils Properties Used in Sudan

Abstract

This study explains the properties of lubrication oils unused & after use. The total number of samples used in this study were 14 samples 8 oils (gasoline ) and 6oils (diesel ) were conducted by specialized work- shops with certain devices . The samples were taken directly from engines and followed by regular registration for kilometers. These samples were tested before and after the use to define certain physicochemical properties, viscosity, density, basicity and acidity, color, ash content and anti-oxidant, erosion properties. The concentration of certain metals (Fe-Pb-Ni-Cu) in the oil was also determined using standard atomic absorption spectra photometer method. However in concentration of metals (Ca-Mg-Zn-P) were measured by X—ray fluoresces method. . The study covers the effect of environment and climate on engine the study shows the mixing of oil with oxidation and corrosion, erosion and dust all, leads to change in the properties of oil either decrease or increase the property under discussion. Found that there was a decrease in the total base number in the used oils due to presence oh the acids resulting from oxidation .There were a decrease in additives due to consumption. Some oils show increase in viscosity and this may be due to contamination by solid materials. There was an increase in concentration of iron, lead, copper, and this may be due to friction and rust.