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Conditioning monitoring is constantly helpful in scheduling maintenance activity and deciding the oil drain period for engines to ascertain the highest performance. Conditioning monitoring assures increased availability, higher design efficiency, and reduced maintenance cost. In the present work, experiments were performed on two identical singlecylinder engines by running them for 144 hours at a constant speed of 1500 rpm. The first engine was fueled with butanol blended fuel and the second with neat diesel fuel. Three samples of engine oil from each engine were collected after 48, 96, and 144 hours respectively. The engine oil (multigrade servo 20W-40) samples were examined to determine the condition of the engine by two methods: wear metal analysis; and physical and chemical tests. The wear metal analysis was monitored by the ICE 3000 series atomic absorption spectrometer. The viscosity was measured using the Anton Paar Rheolab QC rheometer at a constant speed of 1200 rpm and 40 C temperature and the total acid number was measured by the titration method. The metal wear, total acid number, and viscosity in the butanol-fueled engine were slightly greater than those of the diesel-fueled engine.

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The study of lube oil is useful in scheduled maintenance activity, determining the oil replacement time for engines, to increase the engine life and ensure the maximum performance. Investigation of engine oil can reduce maintenance cost and promises higher design efficiency. Experiments were carried out on a mono cylinder compression ignition engine fueled with diesel-ethanol blended, which is operated at a constant rated speed of 1500 rpm for 100 hours. The lube oil samples were subjected to wear metal tests, chemical and physical tests. The quantity of wear metal in the engine oil was observed using the atomic absorption spectrometer. The total base number and total acid number were measured by the titration method according to ASTM code ASTM D6654 and ASTM2896, respectively. The viscosity was determined using the Stab Viscometer, SVM3000, by the ASTM D445 method at 40 o C temperature. Iron and copper concertation was increased with an increase in usage time. However, TBN decreased, and TAN increased with the usage time. Viscosity and density decrease with the increase in usage time. The lube oil shows that the engine can be operated for an extended time with the same lube oil since all the measured parameters are within the limit.