Is it possible to make my own oil instead of finding it from restaurants?

Oil press machine

A growing number of our customers are growing a seed crop, pressing the harvest, selling the left over meal for cattle feed, and using the oil to make biodiesel.  Of the farms that use our biodiesel processors and have calculated their costs, they are averaging around $1.50 to $2.50 per gallon to make their own fuel.  Comparing that to the price of diesel, they are still saving a lot of money.