A motorist who put a video on YouTube claiming he'd been overcharged for repairs is being sued for defamation by the dealership.

Surveillance expert Dwayne Cooney installed a camera in his Chevrolet Malibu before it went for repairs at Jim Butler Chevrolet at St Louis, USA, and claims it shows technicians worked on the car for just 1.5 hours however he was charged for 4.5 hours' labour.

Cooney put an edited version of the video on YouTube, where it has received more than 13,000 views.

Jim Butler Chevrolet has denied overcharging, saying it worked on the car on two separate days, and is suing Cooney for $25,000 damages, reports the St Louis Post Dispatch.