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I don't know what your injection system is like, but with bosch rotary pumps like in my TDI one thing's for sure, you don't want to spend you time switching between bio and ulsd. Bio diesel will make the seals swell, and ulsd will make them shrink. Eventually, you get a leaky injection pump, and some seals are more tricky to replace than others, so you might very well end up with a junked pump.
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