Here's something on lubrication from the Technical Handbook for Marine Biodiesel in Recreational Boats Lubricity Properties Biodiesel has been studied extensively in Europe and the U.S. for its effect on long term engine wear, particularly with respect to those components normally lubricated by the fuel itself. Fuel pumps and injector pumps depend on the operating fuel for lubrication of moving parts and shaft bearings. Initial work on the lubricity of Biodiesel, performed by Mark-IV Group and the Southwest Research Institute in 1994, established a clear advantage to blending Biodiesel with petrodiesel to achieve superior lubrication. Lubricity properties are measured at the Southwest Research Institute (SWRI) by a "Ball On Cylinder Lubricity Evaluator" (BOCLE) machine to measure metal to metal hydrodynamic wear simulating rotating shafts and bearings. A static steel ball is loaded onto the edge of a rotating disc and the diameter of the subsequent scar on the ball is measured (similar reciprocating machines exist in Europe to measure scar on a steel ball, and newer versions have been developed in America to improve lubricity measurements). The BOCLE test does not measure adhesive friction wear. Tests run by Exxon showed that, compared to reference diesel fuel in 1993, a T
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