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To convert veg oil to bio diesel you need to remove the glycerin, (this is what makes it thick), you need 5 litres of methanol and some caustic soda, you then have to heat up the oil to 50c and aggitate it for 1 hour with the methanol caustic soda mix,
Veg oil works a lot better in indirect injection engines, I have personally used it in a peugoet 106 1527cc/or the saxo 1527cc, as these are the same car and engine,
If you use neat veg oil it will start to clean out your fuel system, so expect to change the fuel filter regularly, also veg oil unprocessed is quite a lot thicker than diesel so if you have an air leak on your fuel line, expect it to get a lot worse, then the engine will have a rough tickover, to be safe mix 50/50 with diesel,
and the biggest bonus is there is no fuel duty to pay on the veg oil, so long as you do less than 25,000 miles per year, I think you have to keep your receipts to prove how much you use if you get pulled.
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