HENNEPIN CO. (FOX 9) - The first tip came in from Wisconsin .

A man who’d sold a truck for less than half of what he’d asked was suspicious of the buyers from Minneapolis - who found engine problems and convinced him to drop the price.

"Took it for a test drive, came back and said you have oil inside your radiator," explained Hennepin County Sheriff's Office Detective Kevin Kedrowski.

The seller didn’t know there was a problem, but agreed, though he still wondered.

He checked his doorbell camera video and saw it clear as day.

While two men distracted him, a third checked under the hood. The video showed him pouring oil into the radiator, creating the illusion of a major engine leak.

Suspected scammers

What we know:

The Hennepin County Sheriff's Office tracked the buyers to a

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