in a word, NO NO and NO...
the veg oil doesn't provide the same lubrication for the high pressure pump as DERV, so it will wreck it...
veg oil is only really for DTi's fitted with a conversion kit.. common rail diesels mustn't use it...
before you try it, think about this.. is it worth saving £30 a fill on fuel if you could cause £3-4000 worth of damage to your car?...
as for the DTi's they CAN run on it IF they have the kit fitted, BUT they must then be serviced every 5,000 miles as the bio won't blend in the engine oil and that also causes problems..also, you MUST change the fuel filter after you switch to Bio as the bio 'scours' all the cr4p out of the tank and deposits it in the filter.. so you need to keep the fule filter changed every 5,000 as well..
even new oil isn't in a state that you can just add it to your tank..it needs a seperate tank to the DERV as you have to start on DERV, then switch to bio.. and before you turn off it's best to switch back to DERV.. Veg oil dosen't burn the same as Biodeisel until it's heated, so you have to fit a preheater to the seperate veg oil line ( with seperate filter) before it can be burnt..
Bio deisel and veg oil are completly different (bio deisel containing methanol to crack the fatty acids in it and having been extensively pre filtered) and have to be treated as such..
for more info, and expert advice may i suggest you contact dieselveg
www.dieselveg.co.uk or another of the biofuel producers...
If you have £2.5K to spare you can now buy machines you can use at home which will produce you 50 litres of bio fuel per day as an automatic process...
But, in short, for a CDTi the answer is really a straight NO to veg oil fuel... Bio diesel thou is possible, but only when blended with a high amount of DERV to provide the pump lube..
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