Okla. Stat. tit. 68, § 68-2104: Value of vehicles

A. The value of any motor vehicle, except a manufactured home,

for the purposes of the excise tax levied by Section 2103 of this

title, shall be determined as of the time the person applying for a

certificate of title thereto obtained either ownership or possession

of the vehicle, which shall be presumed to be the actual date of the

sale or other transfer of ownership, and assignment of the

certificate of title.

B. The value of any vehicle, for purposes of the excise tax

levied by Section 2103 of this title, shall be the actual sales

price of such a vehicle. The actual sales price of the vehicle,

which total shall be the basis of the motor vehicle excise tax, as

well as the number of tires on the vehicle and the tire rim

diameters, shall be entered on the bill of sale furnished by the

seller to the purchaser, or on such other form as may be prescribed

by Service Oklahoma.

Upon receipt of the properly completed bill of sale or other

form as prescribed by Service Oklahoma, and the payment of all

applicable taxes and fees, Service Oklahoma or an appointed licensed

operator shall issue a vehicle certificate of title in accordance

with the provisions of the Oklahoma Vehicle License and Registration

Act.