i got a 309 j reg Peugeot,how do i get it to run on chip oil.?

Only if it is a diesel

i have run several vehicles on different oils and find that using a 50/50 oil and diesel mix works best.

if its diesel it will run off cooking oil but don't let customs and excise catch ya cos its illegal cos of tax issues.

Provided your Peugeot is diesel it is easily attainable. What is most important is that the oil should be filtered prior to putting it in your fuel tank. Another consideration is to use cotton seed oil instead of the usual canola oil (it tends to clog up the vehicles fuel filter and requires changing often)A friend of mine drives a diesel Toyota Hilux. He installed a separate tank for the oil and associated fuel line and installed a valve which would switch between oil and diesel, and a completely separate fuel filter. He also directed the oil line around the exhaust manifold to pre heat the oil prior to entering the fuel pump, using copper piping to cope with the heat from the manifold. Cold oil does not combust as well and you may experience difficulty starting, as you are in the UK. He also fitted a switch box in the cabin which controlled the valve (diesel/oil), a separate electric pump for the oil, and also the fuel gauge for each tank. He works in a restaurant and gets all the used oil he needs, and does heat it on a low temperature for easier filtering, prior to filling up the tank.