Oregon Revised Statutes Mortgages and Liens § 86.050

Whenever a mortgagor fails to pay when due any taxes, assessments, interest on prior mortgages, insurance premiums or other charges necessary to be paid for the protection of the lien of a mortgagee, the mortgagee may pay the same, and such payments shall be added to the mortgage debt and secured by the mortgage held by the mortgagee, and shall bear interest at the same rate as specified in the mortgage. This section applies only to mortgages executed after June 3, 1929, and does not affect the right of parties to specifically contract otherwise than as provided in this section.