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I agree on the difficulty getting free cooking oil. I find the smaller places will still give it to me. Forget the big name fast food places.
By the way, not all get paid. I spoke with the manager of a big chain that said they still pay to get rid of their used oil. For big corporations I have a feeling it is more about liability. They want to know who is handling their waste.
One tip about grease from a guy who designs cleaners for a living: If you aren't going to drive the grease vehicle for a while, drain the fuel and replace it with diesel. The air reacts with WVO to create a polymerized film. Smells like paint and in a way actually is. Tough to remove once it forms. We call it "chicken skin" and it can cause all sorts of problems clogging fuel lines after the vehicle has sat a few months. Trust me...
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