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I've run a 2005 "Cherokee" CRD for 50,000 miles on B100 and blends down to B20. I've, nor has anyone else I know, had such pump failures with the possible exception of the new VW common rail TDIs -- those are apparently failing because of the lack of lubricity in the pump diesel; no one running biodiesel blends has had a pump failure.
90p a UK gallon is an excellent price for biodiesel. That's what we pay here for a US gallon of petroleum diesel. With the crap diesel I get, my mileage is actually better on biodiesel especially in the winter.
In your experiments, I would leave out the vegetable oil, that will definitely cause problems with ring coking and sump oil polymerization.
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