hi mate , don't take this the wrong way but i wouldn't go shouting about this on a public forum , you never know who's reading
as for the question you need to keep the mix half and half max and change the fuel filters more often , not got a derv my self but someone on here will give you a fuller answer about running cooking oil in a car on private land
welcome to the forum
Rob
I have run diesels for ages on bio/WVO/SVO so have a *bit* of experience.I have done lots n lots n lots of miles on public roads legally!
To start off with i dont know what the issue is with talking about it on a public forum ? Up until recently you registered with C+E and put a return in , now you have a 2500l/anum allowance - whats the issue ? Carpy25 - I wouldnt question the integrity of someone i dont know , especially if there is nothing illicit occuring . ( unless colin is shoplifting it).
IIHO the whole issue is a nightmare/minefield !! There are a million websites and a million opinions! ( oh , and everyone is an expert).
I have only run older 'mechanical' diesels on anything with veggie oil in and TBH not kept them for long enough to see any real damage to the pump (10k at the most maybe)
The most consistant info appears to be that Bosch pumps are suitable whereas CAV/LUCAS etc are not . The most plausable explanation appears to be in the rotor tolerances in that Bosch are greater. The decreased viscosity of 'veggie' puts more pressure on the seals ( hydraulic action) also the lubricating properties are alledgedly questionable.
Oil has better cleaning properties than diesel - it will strip all the gunk from tank/lines etc and dump it in the filter. Change fuel filter at 500 miles then at a 1000 and all should be ok .As a recaution i carries a spare filter and a large bottle of injector cleaner as a precaution ( fill up filter with injector cleaner to prime it). I only got caught out once and that was 4.5k miles after a filter change.
I have not seen anything about long term effects on engines/pumps. The only info i have to go on is i have a good friend who works as a VAG mechanic ( he's one of the older/better ones BTW!) and he is totally against it due to cars he sees coming in with knackered pumps . At the end of the day VAG r+D budget was spent on developing pumps to work on pump diesel.
The million dollar question , would i do it ?
In my current car , no! I didnt mind using it on older engines where i could fix it myself for pennies. This car is a 'keeper' and i would like to see a bit more evidence before i commit.
Tesco was selling oil for 7p/l less than diesel last week - is it worth it ?
I have heard it is possible to strain cherry thr' cat litter though , must be true - a man in the pub told me!