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Well i needed to fill up, went to station and saw a green sticker that said bio mass fuel. from 5 to 20 percent . not sure what this means. i only put 25 dollars in because i needed fuel. should i be worried?
Not if you use it straight away. It can absorb water from the atmosphere more rapidly than mineral diesel. Only an issue if you let it sit in the tank for an extended period - like many months.
If you're going to make it a regular thing you may want to upgrade the seals in the fuel bowl, do the Hutch mod, and put in an in-line water-seperator filter.
I've just done all the fuel system changes to use this fuel, too bad it's not sold here in Aussie land!