Oregon Revised Statutes Insurance § 742.546

(1) When a motor vehicle liability insurer obtains a release for bodily injuries within 60 calendar days following an accident from a person who is eligible to receive personal injury protection benefits under ORS 742.518 to 742.542, the release must state that, subject to the motor vehicle liability insurer's applicable limits of liability, the rights of an insurer furnishing personal injury protection to recover payments made for medical benefits from the motor vehicle liability insurer are not impaired.

(2) Nothing in this section impairs the rights of a motor vehicle liability insurer to contest a recovery claim from an insurer furnishing personal injury protection, based upon liability or the reasonableness or necessity of medical benefits paid by the insurer furnishing personal injury protection.