Okla. Stat. tit. 68, § 5301

A. A tax is hereby imposed in lieu of the ad valorem tax on the inventories of new automobiles, new trucks, new travel trailers, new manufactured homes, new recreational vehicles and new motorcycles owned and/or possessed for sale by Oklahoma licensed dealers, licensed under the Oklahoma Vehicle License and Registration Act, and on the inventories of new vessels and new motors owned and/or possessed for sale by Oklahoma licensed dealers licensed pursuant to the Oklahoma Vessel and Motor Registration Act. Said tax shall be paid by the dealer on such new vehicles in lieu of the annual ad valorem tax assessment of his average inventory of new vehicles, new manufactured homes, new recreational vehicles, new vessels and new motors, but shall not relieve any other property of the dealer from ad valorem taxation. B. Used motor vehicle dealers shall pay a tax in lieu of the ad valorem tax on inventories of used motor vehicles as provided for in Section 1137.1 of Title 47 of the Oklahoma Statutes.