WVO to diesel ratio

I wanted to verify someinformation that I got from an associate and fellow 300D mercedes owner.
My associate says that he gets his 100% vegetable oil from a Goldebn Pantry Convenience store that sells alot of fried chicken and potato wedges.
He says that he simply filters the used grease through a 5 micron filter and into his fuel tank.
Is this possible and is there a certain ratio of diesel that should be in the tank to guarentee that the car will start freely and will run efficiently?

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