The 310 was built by Datsun.
The Datsun 310 was produced from 1981 to 1982.
Datsun stopped production on the 310 in the 1982 model year. Datsun produced the 310 for 1 year.
The Omni was built by Dodge.
The Dodge Omni was produced from 1981 to 1990.
Dodge stopped production on the Omni in the 1990 model year. Dodge produced the Omni for 9 years.