Abstract
Lubricants play a key role in lubrication of components of internal combustion engine and enhancing the working life of engine. Load carrying capacity of lubricating oil is important parameter for their various different applications. The anti-wear and extreme pressure additive properties studied have been found to show anti wear anti friction properties of lubricants under the experimental condition. In this paper, extreme pressure and anti-wear of fresh and used SAE 15W40 and SAE 20W50 grade lubricating engine oil of different working time cycle were investigated. Tests were carried out according to the standard test methods for measurement of wear preventive properties and extreme pressure properties of lubricating oils, using an ASTM D4172 and ASTM D2783. The tests were carried out on Ducom four ball tester TR-30L under atmospheric pressure of lubricating oil at 392N loads and at 75°C temperature with constant speed of 1250 rpm.
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