Biodiesel in low concentration will not cause pumps and seals to leak. As little as 1% in the fuel will give more benefit than 2 stroke oil.
I run 100% biodiesel in my Liberty CRD (VM 2.8 CDI), my VW TDI, and my Mercedes 240D (W123) and only had to replace the seals on my VW pump after running straight ULSD diesel, cost less than $100.
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I'm not coasting, I'm shifting slowly.
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