Possibilities of detecting diesel leaking into engine oil with fuel sniffer

Abstract

The paper presents the possibilities of detecting diesel fuel without rapeseed methyl ester (RME) in the concentration range of 0–9.54 wt% leaking into engine oil of SAE 15W–40 viscosity specifications using Spectro FDM Q600 – Fuel Sniffer. The results are confronted with regard to the determination of the accuracy and precision of the repeatability of measuring diesel fuel in oil with this type of instrument. By expressing the linear dependence between the diesel concentration determined by Fuel Sniffer and the actual diesel concentration in engine oil of model samples, correlation R = 0.998 was obtained. From the point of view of verifying the accuracy of the method, it was not proved that it would be burdened with systematic errors. Precision of measurement by this instrument, expressed as repeatability, reached RSD below 5% only for the concentration of diesel in the oil higher than 3.33 wt%.