Stop in for a cup of coffee

Mattax said

Suppose it depends on what its burning in.
I'm sure with a little experimneting most systems can be made to run on junk. Look at the number of trucks people set up to burn leftover grease from McDs and Chinese restraunts.

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Yep, just requires a couple extra filters and a pre-heater. I’ve got a buddy that has contracts with various restaurants around here for their used frier oil. He gets it free, they don’t have to pay and it works great for all. I’ve helped him strain and filter it before, which is a true pita, but he runs all his trucks on it. He does spray foam insulation for a business.

thing with oil like that, you start on diesel fuel, when it gets to operating temp and the oil is to a certain temp, you flip a switch.