Quick answer: a notarized Inheritance Affidavit (Form 735-516), signed by every heir. If a simple estate affidavit was already filed with the county, Form 6797 works instead.
Every heir has to sign, not just one
DMV won't identify the heirs for you
Heirs are determined according to ORS Chapter 112, and DMV explicitly states it cannot determine the heirs on the family's behalf — families may need to seek legal counsel just to confirm who legally qualifies before the affidavit can even be completed correctly.
Already filed a simple estate affidavit? A different form applies
If a simple estate affidavit was already filed with the county court, DMV can instead accept a copy of that court-filed affidavit, or a Simple Estate Certification, Form 6797, completed by the affiant — the separate Inheritance Affidavit isn't needed in that situation.
Survivorship skips both forms entirely
When Oregon issued the title with survivorship and one owner has died, the surviving owner can transfer the title with just proof of death — a death certificate, an obituary, or a similar document naming the owner — without an Inheritance Affidavit or any probate involvement.
A local probate attorney can review your estate — many offer a free consultation.
DMV processes these transfers the same way at any Oregon office statewide — in Multnomah, Washington, Clackamas, or any other county — regardless of which county's probate court would otherwise handle a formal estate.