I've made biodiesel for 10 years. I only screen my fryer oil and collect in a 55 gallon drum. I drain water and gook from a bottom drain and suck oil out of a standpipe into the processor. I have nearly 200, 000 miles on the Ford diesel. I burn it in a Dodge diesel, the Ford, my 83 Mercedes C, my Kubota, shop oil heater and my two Listeroids. My only complaints are, it eats all rubber and it gels below freezing and where I live it freezes a lot. There are a few months a year I burn dino diesel, Doc.