Jan 4 (Reuters) - Exxon Mobil said on Thursday that changes in oil prices would impact the top U.S. oil producer's upstream earnings by $400 million to $800 million for the last three months of 2023, compared with the third quarter.

The company posted $6.1 billion in upstream earnings for the third quarter ended Sept. 30. (Reporting by Tanay Dhumal in Bengaluru; Editing by Sriraj Kalluvila)