Use of biodiesel produces engine oil dilution because of unburned biodiesel impinging on cold walls of the combustion chamber,\r\nbeing scrapped to the oil pan, and leading to changes of oil friction, wear and lubricity properties. In this paper, mixtures of SAE\r\n15W-40 oil, which were contaminated by known percentages of the biodiesels from canola oil, peanut oil, soybean oil, and chicken\r\nfat, were tested in a pin-on-disk tribometer. A contact was employed of AISI 1018 steel disk and AISI 316 stainless-steel ball for\r\npin material, and friction force and specific wear were measured. Wear on the disk surfaces showed that any degree of mineraloil\r\ndilution by the tested biodiesels reduces the wear protection of engine oil even at small mixture percentages. However, these\r\nreductions were not substantially different than those observed for same percentages of dilution of mineral oil by fossil diesel.\r\nThe tested mixture of oil contaminated with animal fat feedstock (e.g., chicken fat) biodiesel showed the best wear behavior as\r\ncompared to those for the other tested mixtures (of mineral oil with vegetable feedstock biodiesel dilutions). Obtained results are\r\ndiscussed as baseline for further studies in a renewable energy multidisciplinary approach on biofuels and biolubes.
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