Okla. Stat. tit. 31, § 13
A preservation trust may be established as a revocable or irrevocable trust. If the grantor of a preservation trust revokes the preservation trust the exemption provisions of Section 3 of this act shall not be applicable on the date the grantor revokes the preservation trust.
Laws 2004, HB 2135, c. 509, § 4, emerg. eff. June 9, 2004.