Most modern*diesels can't use more than b20. It's beacuase of how they handle the regen process. Engines that can use b100 have an enjector built into the exhaust system. Manufacturers now use the computer to inject fule into the cylinders during the exhaust stroke. This saves money on parts. The issue is biodiesel is more viscous and not all the biodiesel will atomize. So some fuel will seep past the rings and contaminate the oil.*
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