Section 803.591 - Requirements for vehicles with diesel engines; exceptions; rules(1) As used in this section and ORS 803.593: (a) "Diesel engine" has the meaning given that term in ORS 468A.795.(b) "Heavy-duty truck" has the meaning given that term in ORS 468A.795.(c) "Medium-duty truck" has the meaning given that term in ORS 468A.795.(d) "Public body" has the meaning given that term in ORS 174.109.(2) On and after January 1, 2025, the Department of Transportation may not issue a certificate of title for the following motor vehicles if the address of the owner of the motor vehicle is located within Multnomah, Clackamas or Washington County: (a) A medium-duty truck powered by a model year 2009 or older diesel engine.(b) A heavy-duty truck powered by a model year 2006 or older diesel engine.(3) The department may not issue registration or renewal of registration on and after the following dates for the following motor vehicles if the address of the owner of the motor vehicle is located within Multnomah, Clackamas or Washington County: (a) January 1, 2023, for a medium-duty truck or a heavy-duty truck if the motor vehicle is powered by a model year 1996 or older diesel engine.(b) January 1, 2029, for:(A) A medium-duty truck powered by a model year 2009 or older diesel engine.(B) A heavy-duty truck powered by a model year 2009 or older diesel engine owned by a public body.(C) A heavy-duty truck powered by a model year 2006 or older diesel engine owned by a person other than a public body.(4) Notwithstanding subsections (2) and (3) of this section, the department may issue a certificate of title, issue registration or issue renewal of registration for a motor vehicle described in subsection (2) or (3) of this section after a date described in subsection (2) or (3) of this section if: (a) The diesel engine that powers the motor vehicle has been retrofitted with approved retrofit technology pursuant to rules adopted by the Environmental Quality Commission under ORS 468A.810; and(b) Proof of certification of the retrofit has been issued under ORS 468A.810.(5) The following motor vehicles are exempt from the requirements of this section:(a) Motor vehicles registered as farm vehicles under the provisions of ORS 805.300.(c) Implements of husbandry.(d) Motor vehicles used exclusively as training vehicles.(e) Publicly and privately owned emergency vehicles.(i) Recreational vehicles.(j) Heavy-duty trucks operated for 5,000 miles or fewer on highways of this state during one calendar year.(k) Carriers with a fleet size of five or fewer heavy-duty trucks.(m) Motor trucks, as defined in ORS 801.355, used primarily to transport logs.(6)(a) In order for registration to continue to be valid for a motor vehicle that is owned by a public body and subject to subsection (3) of this section, the public body shall, in a manner determined by the department by rule, submit proof to the department that the motor vehicle complies with subsection (3) of this section. Proof of compliance must be on a form supplied by the department and must include such information as the department may require. Proof of compliance for a motor vehicle owned by a public body is valid until the ownership of the vehicle changes.(b) The department shall provide notice to a public body of the requirement under this subsection to submit proof of compliance with subsection (3) of this section. The notice shall be issued to the public body no later than one year prior to the date that the proof of compliance must be submitted to the department.(7) The department may adopt rules as necessary to administer this section.803.591 and 803.593 were added to and made a part of the Oregon Vehicle Code by legislative action but were not added to ORS chapter 803 or any series therein. See Preface to Oregon Revised Statutes for further explanation.