Involved in triterpenoid saponin biosynthesis in roots (PubMed:28371833). Catalyzes the hydroxylation of beta-amyrin at the C-16 beta position to form maniladiol (PubMed:28371833). Is also able to oxidize oleanolat to cochalate (PubMed:28371833). Has weak activity catalyzing the three-step oxidation at C-28 of beta-amyrin to form oleanolate (PubMed:28371833). beta-amyrin + O2 + reduced [NADPH--hemoprotein reductase] = H(+) + H2O + maniladiol + oxidized [NADPH--hemoprotein reductase] O2 + oleanolate + reduced [NADPH--hemoprotein reductase] = cochalate + H(+) + H2O + oxidized [NADPH--hemoprotein reductase] Highly expressed in roots (PubMed:28371833). Expressed at very low levels in leaves and petals (PubMed:28371833). Belongs to the cytochrome P450 family.