Relating to engine emissions; prescribing an effective date; providing for revenue raising that requires approval by a three-fifths majority.

Imposes excise tax on retail sale of tires, privilege tax for engaging in business of providing nonroad diesel equipment, tax on use in Oregon of nonroad diesel equipment purchased out of state at retail, heavy equipment rental tax on rentals of nonroad diesel equipment, privilege tax on heavy-duty vehicles and license tax on dyed diesel for transfer to Clean Diesel Engine Fund. Increases cap on grants or loans awarded from Clean Diesel Engine Fund for repower of nonroad diesel engine to 50 percent of certified costs. Directs Environmental Quality Commission to establish preference for grants and loans from fund for replacements, repowers or retrofits necessary to satisfy certain title and registration requirements for heavy- or medium-duty trucks powered by diesel engines. Takes effect on 91st day following adjournment sine die.