Using frying oil for diesel engines

[Vudak]

My friends have a small bio-diesel business.  It had relatively small start-up costs, and they seem to make enough money to keep driving around to fast food chains for oil every week.

If you invest some research and go to a few auctions, you could fairly easily make your own, so long as you don't mind your garage/basement looking like some sort of meth lab

[Angus]

I am using mostly the gear from my days as a dairy farmer. Filters, buckets and eventually a 1000 ltr tank.
I use some 30% in the blend and the only difference I feel is the engine running smoother and delivering more power.
I did filter the oil quite a lot, and this business makes a whole sea of mess, so that's what I'm working on now.