there is a usually free biodiesel in every restuarant in america, as long as they have a fryer. you can use fryer oil in diesel engines down to certain temperatures, without mixing any diesel with it. below a certain temp you have to put additives in it to keep it from geling. i have a diesel and was going to do it before i decided to sell it. it takes a small investment to filter it and some time going around finding places to give it to you. but most restuarants pay to get rid of it.
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