the problem with the D5 and other common rail high pressure diesel fuel systems is that the biodiesel lacks the correct lubricant ability or lubricity compared to normal diesel. low sulphur fuel has extra components/additives added in order to increase the lubricity (lack of sulpuhr compounds reduced lubricity)
To run on biodiesel you would need to ideally measure the lubricity of biodiesel and compare it to normal diesel. you would also need to add something to increase it. the fuel lubricates the fuel pump so a lack of lubricity isnt good for the pump. the same is true for older diesel engines (non common rail) but the time for the detrimental affect to occur is longer.
check with volvo by emailing customer support in sweden as asking direct about the affect on the fuel pump. as the pumps arent made by volvo the question would be from volvos supplier.
I suspect they wont recomment a D5 uses biodiesel
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