Does biodiesel cause degradation of engine gaskets and seals?
The recent switch to low-sulfur diesel fuel has caused most Original Equipment Manufacturers (OEMs) to switch to components that are also suitable for use with biodiesel. In general, biodiesel used in pure form can soften and degrade certain types of elastomers and natural rubber compounds over time. Using high percentage blends can negatively impact fuel system components (primarily fuel hoses and fuel pump seals) that contain elastomer compounds incompatible with biodiesel. The effect is lessened as the biodiesel blend level is decreased. Experience with B20 suggests that no changes to gaskets or hoses are necessary.
