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In this work Different weight of pure Copper,Nickel,Cobalt and Iron fine powders were blended carefully with engine Oil.X-ray fluorescence system was operated at 30KV and 17mA,the XRF intensities of Kα lines for all samples were measured at the peak and at background.The Lower Limit detection (LLD) and Sensitivity (m) of XRF Spectrometer were determined for different metal particles with different Concentrations (Wt%).The results of LLD and sensitivity of all suspended samples were plotted as a function of concentration , and the average values of LLD and m were calculated and plotted as a function of atomic number of metal particles suspended in engine oil. Introduction X-ray fluorescence analysis(XRF)is a well established convenient method for qualitative and quantitative elemental compositional analysis of solid and liquid and its Nondestructive techniques for chemical analysis of materials.In recent year(XRF)has been found to offer advantages of speed and accuracy. The determination of different metal particles in engine oil is established as valuable means of assessing concentration of metal particles in engine oil as a final product which was involved base oil and additives (Robert.R.w.,1996).in 1954 Gunn(Gunn.E.L ,1964)study the application of X-ray fluorescence to the analysis of suspended particles in liquid hydrocarbons and study the effect of particle size on X-ray fluorescence intensity,and in 1998 Darrel (Darrell.B.C.,1998)was analyzed the engine oil filter for chemical elemental content using X-ray fluorescence technique. The larger field of oil analysis which includes analysis of suspended particles, further evaluates the lubricant for its condition and for the presence of other contaminates,such as fuel, coolant and Water(Robert.R.w.,1997). I-Lower Limit Detection The X-ray fluorescence method is particularly applicable to the quantitative and qualitative analysis of low concentrations of elements in a wide range of samples as well as allowing the analysis of elements at a

Determined the parameters effected on sensitivity and lower limit detection of XRF–WDS for different metals particles suspended in engine oil.