Okla. Stat. tit. 60, § 60-174
Liability of trustees and beneficiaries
Liability to third persons for any act, omission, or obligation
of a trustee or trustees of an express trust when acting in such
capacity, shall extend to the whole of the trust estate held by such
trustee or trustees, or so much thereof as may be necessary to
discharge such liability, but no personal liability shall attach to
the trustee or the beneficiaries of such trust for any such act,
omission or liability.