In my 13 I add 40 oz of b100 to give me a 2% mix of bio and diesel. Based on what I have read, an independent article on diesel fuel additives that is linked on the TDI forum 2% gave some great lubricity increases in the fuel. There is as an additive: XPD Diesel Fuel Improver which also tested well.
I have my DPF still in place so I an being careful of what I run.
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