This year, officials in several Northern California counties issued warnings to people selling their used cars. Allegedly, a group of three people would arrange to take a look at a listed vehicle. When they arrived, their scam unfolded in full force.

One buyer would distract the seller while two others “inspected” under the car’s hood. During the look-see, the scammers would pour oil on the engine. Then, they’d go for a test drive.

As the engine warmed up, the heated oil burned off, creating large amounts of worrisome smoke (and a terrible smell).

The scammers would offer sellers a drastically “lowball” amount for their used cars.

Placer Country investigators tracing several complaints found a surprising total of seven California counties all exploring the same scam.

Ultimately, close examination led the Placer County District Attorney’s Office to file felony vandalism and felony theft by false pretense charges against three suspects, Fox 40 reported.

As it turns out, Oklahoma’s Chickasaw Lighthorse Police Department already arrested one suspect, Michael Tanase, back in July. Tanase, accused of public drunkenness and disturbing the peace, also committed a hit-and-run.

Officials transferred Tanase to Placer County. According to Fox 40, the two other suspects have yet to be arrested.

For those selling used cars, it’s best to stay vigilant and keep safety in mind. Unless your vehicle has known issues, sudden-onset “problems” after someone touches the car should be a red flag. Decline lowball offers and consider filing a complaint with authorities if something like this happens to you.