Primarily hydroxylates the omega-carbon of a number of methyl-branched lipids, including (2E,6E)-farnesol, phytanate, geranylgeraniol, 15-methylpalmitate and (2E,6E)-farnesyl diphosphate. Also catalyzes the sequential oxidation of the terminal methyl of cholest-4-en-3-one into (25R)-26-hydroxycholest-4-en-3-one (alcohol), (25R)-26-oxocholest-4-en-3-one (aldehyde), to finally yield the carboxylic acid (25R)-3-oxocholest-4-en-26-oate. Also able to sequentially oxidize cholesterol itself, not only cholest-4-en-3-one. a methyl-branched lipid + O2 + 2 reduced ferredoxin [iron-sulfur] cluster + 2 H(+) = an omega-hydroxy-methyl-branched lipid + H2O + 2 oxidized ferredoxin [iron-sulfur] cluster. cholest-4-en-3-one + 5 H(+) + 3 O2 + 6 reduced [2Fe-2S]-[ferredoxin] = (25R)-3-oxocholest-4-en-26-oate + 4 H2O + 6 oxidized [2Fe-2S]-[ferredoxin] Lipid metabolism; branched-chain fatty acid metabolism. Belongs to the cytochrome P450 family.