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Impact of pure biodiesel fuel on the service life of engine-lubricant: A case study

2019; Elsevier BV; Volume: 261; Linguagem: Inglês

10.1016/j.fuel.2019.116418

1873-7153

F. M. Pereira, José Antonio Velásquez, Jorge Riechi, Juscelino Teixeira, Luis Eduardo Ronconi, Silvio Riolfi, Élcio L. Karas, Ricardo Alexandre Magalhães de Abreu, José C. Travain,

Lubricants and Their Additives

This work presents a study about the effects that pure biodiesel fuel causes on the engine-lubricant oil. For this study a fleet of buses employed for urban public transportation in the city of Curitiba, Southern Brazil, was monitored along 18 months. Samples of engine lubricant were collected periodically from a set of 7 vehicles, 4 of which ran fueled by pure biodiesel, while the other 3 utilized mineral diesel fuel, thus the latter group served as a reference for comparisons. The collected samples had the following characteristics evaluated: viscosity, basicity, acidity, oxidation, as well as content of iron, copper, lead and aluminum. The analysis of gathered data allowed pointing out the viscosity as the most sensitive among the characteristics of the engine-lubricant oil that are affected by the use of pure biodiesel fuel, thus enabling its adoption as a control parameter for judging whether the lubricant charge is still serviceable. In addition, it was found that replacing mineral diesel by pure biodiesel fuel diminished the service-life mileage of the engine-lubricant oil charge from 20,000 to 13,000 km for mono-articulated buses, and from 15,000 to 10,000 km for bi-articulated ones. Therefore, this mileage was reduced to approximately two-thirds of the value recommended for vehicles fueled by conventional diesel.