For what its worth. If your interested in using oil why not find a source of used fryer oil?
I make bio diesel from used oil and run it in my car (87 Jetta turbo diesel) with no ill effects and not difference in operation and no modifications needed.
It will save a lot of pressing and in some instances you can help the guy out by getting rid of his used oil (that he may have to pay for anyway) and using it in an environmentally sustainable way.
Not to mention becoming co2 neutral