Just to help clarify as I don't want to jab any more fun into this argument than I already did. There are absolutely no modifications needed for bio-diesel. Even the stock lines from pre 96 cars will hold up for a darn long time.

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76 300D 130K "Stella" (Sold )
74 240D 299K (Donated to Highschool For Senior Project WVO)
83 300TDT 290K (My one and only)
Sanford, NC