Abstract

EU is heading to efforts to promote the use of biofuels. Biofuels are replaced fossil fuels only partially. They are produced by a mixture of fossil fuels and biofuels. For spark ignition engines, the most widely used biofuel E85, a fuel containing 85% ethanol and 15% gasoline. The more biologist is contained in the fuel is thus suffer more from oil charge combustion engine. Therefore, in the paper presented a comparison of the properties of the oil filling when using of fossil fuels (currently contains a small amount of the fuel ethanol) and E85 biofuel. Were monitored passenger vehicle brand Saab 95, namely engine B235 R. From the car was removed a total of 10 samples of engine oil. One part of the samples were removed during operation of the internal combustion engine to the biofuel E85 and the second at operation of the internal combustion engine currently available fossil fuel BA95. The internal combustion engine is used for lubricating motor oil Mobil 1 0W-40th Analysis engine oil are focused on the evaluation of viscosity, density and lubricity.

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