Oregon Revised Statutes Oregon Vehicle Code § 825.302

(1) The Department of Transportation is the true and lawful attorney upon whom all process, summons or notices in any action, suit or proceeding against each motor carrier residing or having its principal place of business outside this state may be served, when such action, suit or proceeding is caused by or relates to the operation of motor vehicles of or by such carrier within the state.

(2) The service of process, summons or notice upon such carrier may be made by leaving a copy thereof, together with a copy of the complaint or order, in the office of the department. The department shall forthwith notify such carrier of such service by letter directed to it at its residence or place of business as shown by the records of the department.