Okla. Admin. Code § 710:45-15-5
The Gross Production and Petroleum Excise Taxes shall be computed on the value of the first actual cash sale of reclaimed oil. The gross value of tank bottoms purchased by a reclaimer shall be the price paid the seller before deduction of Gross Production and Petroleum Excise Taxes. The net amount received by the seller shall be considered to have had taxes deducted. The gross value of oil received by a reclaimer for services rendered or oil recovered at a disposal pit or well shall be the amount received by the reclaimer from its sale. Before computing Gross Production and Petroleum Excise Taxes on such oil, the reclaimer may deduct his actual treating cost from the sale price. Cost allowed to be deducted shall be limited to the cost of chemicals and boiler fuel used in treating the oil and the labor used in the actual treating. There shall be no cost deduction allowed for oil upon which no tax is paid or upon which the gross value is the purchase price paid by the reclaimer. [See: 68 O.S. § 1015.1 ]
Okla. Admin. Code § 710:45-15-5