Metal additives composition and its effect on lubricant characteristic

This study present and discuss the effect of metal additives compositions in SAE10W-30 engine oil by evaluating its thermal mass and viscosity behaviour. Five types of engine oils from commercially available lubricant and represented the highest quality of SAE 10W-30 oils from each manufacturer were used in experimental section, which are Oil 1, Oil 2, Oil 3, Oil 4, and Oil 5. The oils were fractionated using chromatographic method and the metal additives in the engine oils assessed in the form of its ions present. Viscosity behaviour obtained using rotational viscometer under constant shear rate of 600 s-1 and temperature from 40 to 100 °C. The area under the curve method using 1/3 Simpsons rule was employed by means of evaluating engine oil performance. Heat capacity for each samples were determined using bomb calorimeter in adiabatic mode of operation. The study led to following conclusions; Oil 4 had shown significantly best performance of engine oils amongst the other. Oil 5 exhibits the best performance for viscosity because time required to achieve 100°C is longer than the other with 40.6 minutes.