Multifunctional and multisubstrate cytochrome P450 that oxidizes the respective carbon 18 of abietadienol, abietadienal, levopimaradienol, isopimara-7,15-dienol, isopimara-7,15-dienal, dehydroabietadienol, and dehydroabietadienal. abieta-7,13-dien-18-ol + 2 O2 + 2 reduced [NADPH--hemoprotein reductase] = abieta-7,13-dien-18-oate + 3 H(+) + 3 H2O + 2 oxidized [NADPH--hemoprotein reductase] Optimum pH is7.5-7.6. Expressed in young tissues such as flushing buds and green bark tissues. Lower levels in mature needles and bark. By methyl jasmonate. Belongs to the cytochrome P450 family.