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Bio-diesel and it’s compatibility with rubber. Bio-diesel is a solvent and overtime will degrade any natural rubber in a engines fuel system. Natural rubber parts only appear primarily in vehicles made before 1993. After 1993 most automotive producers started using synthetic rubber or metal parts exclusively. The following materials are also adversely affected by stronger blends of bio-diesel: Nitrile, Polypropylene, Polyvinyl, Tygon, and Fluoro silicons. These materials can be replaced with Teflon, Nylon or Viton.
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