Actor Charles Levin, who appeared in Seinfeld, is believed to have died after his car became trapped along a remote road in the northwestern US state of Oregon, officials said.

Police and rescue workers searched for several days for Levin, 70, whose vehicle was spotted Saturday stuck just off an "almost impassable" road by a resident, the Grants Pass Department of Public Safety said.

Human remains were found after several hours of searching very steep and rugged terrain in the vicinity.

"Based on the circumstances, there is a high probability that the remains are those of Charles Levin," the department said in a statement on Sunday.

Levin's pug dog was found deceased in the stranded vehicle.

Levin memorably played a highly-strung mohel - a person who carries out circumcisions according to Jewish law - in a 1993 episode of acclaimed TV sitcom Seinfeld.

He had minor roles in Woody Allen films Annie Hall and Manhattan, and also in This is Spinal Tap.

Levin was best known for regular roles in sitcom Alice and police procedural Hill Street Blues in the 1980s.