Oregon Revised Statutes Procedure in Civil Proceedings § 12.060

(1) Unless suit or action to enforce a contract for the sale of real property is instituted in the county in which the real property is situated within five years from the date of maturity of the final payment provided for in the contract, or from the date to which the final payment shall have been extended by agreement of record, the contract shall not thereafter be a lien, encumbrance, or cloud on the title of the property.

(2) When the purchase price fixed in the contract is payable in installments, the contract shall be deemed to mature on the date upon which the final payment would be payable if the minimum amount of the principal due on each installment had been paid as provided in the terms of the contract.