2007 ORS § 30.915¹
Defenses

It shall be a defense to a product liability civil action that an alteration or modification of a product occurred under the following circumstances:

(1) The alteration or modification was made without the consent of or was made not in accordance with the instructions or specifications of the manufacturer, distributor, seller or lessor;

(2) The alteration or modification was a substantial contributing factor to the personal injury, death or property damage; and

(3) If the alteration or modification was reasonably foreseeable, the manufacturer, distributor, seller or lessor gave adequate warning. [1977 c.843 §4]