Abstract
Soybean oil methyl esters based biodiesel is a viable alternative to fossil fuels. Apart from its use asan alternative fuel, soybean oil methyl esters have the potential to be used as lubricants due to its inherentlyfavorable lubricity and viscosity index properties. In this study, two soybean based oil forms (crude degummedsoybean oil and soybean methyl esters) and a manufacturers recommended oil were tested as four strokecrankcase lubricants. Engine oil temperature and engine block temperatures were measured at 1 min intervalsfor 40 minutes in a three-engine test stand. The analysis revealed that, compared to the manufacturersrecommended oil control, the equilibrium engine oil and engine block temperatures were not significantlydifferent when soy oil forms were used. These results suggested that soybean oil as well as soybean methylesters could be used as four stroke crankcase oils. Moreover, the used soybean oil forms had a significantamount of deposits suggesting a cleaning action of the oil lines.
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