It looks just like the grease you get after cooking up a batch of French fries, and that's exactly what it is, but with the right modifications to any diesel engine, it can increase a car's gas mileage up to 50 miles per gallon for most vehicles and up to 200 miles per gallon for a select few.
It's called Biodiesel and is available to any driver who wants it.
"You can do it now and it's very simple. The installation procedure is very simple and then all you do is put filtered vegetable oil in your car and you can drive it," said Mark Cheyne, a Biodiesel car owner.
For about a $1,000 you can have your car converted to run on Biodiesel. After that, the fuel is free from restaurants who want to get rid of it, and the cars along with the fuel were on display with hundreds of other energy saving devices at the Energy Fair in Custer this weekend.
Organizers predict the annual event will have drawn a record 16,000 people by the time it ends on Sunday with visitors coming from as far away as Germany and South Africa.
"We had record attendance at the Energy Fair here yesterday. We've parked more cars then we've ever parked, our phones have been ringing off the hook," said Tehri Parker, Energy Fair Executive Director.
And with the current situation in the Middle East causing concern about oil, Parker says she expects that level of interest will only go up in the years to come.