As the title hints at, I'm currently running my 159 1.9JTDm on £1.10 a litre Biodiesel.
Before anyone starts groaning and imagining all sorts of issues with damaged engines, broken fuel pumps, cold weather problems etc can I just dispel a few myths.
I am using 'Biodiesel' NOT cooking oil.
It conforms to EN14214 (which means it must meet certain criteria and compare to fossil diesel)
I have used biodiesel in a HDI engined van for many thousands of miles with no issues (other than a wheel falling off, but I don't think that was fuel related!)
I spent ages looking for examples of other people running Alfas on Bio but have so far only come across one guy on here (IIRC an australian) who posted a big story about how he makes his own and runs is 159 on it, and one other guy who hinted at it in a thread but didn't elaborate.
After a few years looking into producing my own Bio I decided I'm far to lazy to bother, it seems like a perfect solution for creating your own fuel, but have you actually tried to source used veg oil? every man and his dog already have arrangements with local chippys/restaurants etc and buying it from ebay will cost you a minimum 50p a litre, after the cost of the other chemicals and the time and effort it takes to make a good batch it's just not worth it.
I've been running my 159 1.9JTDm on 100% bio for about 3k miles with no problems (I introduced it over a couple of weeks, 50/50 mix first, then 70/30 then 100% Bio)
I have a cold start issue which is being caused by the fuel filter, It's well documented that Biodiesel is a solvent, it cleans your fuel system and dumps all the ****e straight into your fuel filter so it's recommended that after the first 1000 miles or so you should change the filter (it's a service item anyway, so no big deal)
I actually buy BioHeat which is the same as Biodiesel (comes out of the same pump at the place I buy it from) but I have to buy it in containers and put it in the car when I get home.
This way I am classed as a biofuel producer (because I have taken a biofuel not intended for road use and converted the purpose of it to power a road vehicle) this way I can 'produce' 2500 Litres a year without paying fuel duty on it (as long as I keep records to prove how much I use, no problem for me as I have to keep records for work anyway)
(I have seem places advertising BioHeat at 90p per Litre and still conforming to EN14214 I havent tried them yet, but will do)
If anyone wants any clarification of the law (which I have researched extensively) or any advice about Biodiesel. then ask away
And yes it does make your car smell like chips...