Okla. Stat. tit. 58, § 388

After appointment and qualification, the executor or administrator may apply for an order to sell personal property at either public auction or private sale. Upon filing his petition, notice must be mailed to all heirs, legatees and devisees whose addresses are known not less than ten (10) days prior to the hearing of the application. He may also make a similar application, from time to time, so long as any personal property remains in his hands.