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