Okla. Stat. tit. 58, § 58-525: Expenses and compensation

He shall be allowed all necessary expenses in the care,

management and settlement of the estate, and for his services such

fees as are provided in this chapter, but when the decedent, by his

will, makes some other provision for the compensation of his

executor, that shall be a full compensation for his services, unless

by a written instrument, filed in the district court, he renounces

all claim for compensation provided by the will.