 BRM P139 yaive mota yemakwikwi yeFormula One yakagadzirwa naAlec Osborn, yakavakirwa pane yekutanga P126133138 dhizaini naLen Terry, iyo yakamhanya mukati memwaka we1970 na1971. Yaiva neinjini ye3,0-litre V12. Motokari yacho yakanga isingakwanisi kukwikwidzana, iyo yakaguma nemukuru wechikwata Tony Rudd akakumbirwa kusiya basa, uye nzvimbo yake yakatorwa naTony Southgate, Tim Parnell naAubrey Woods. Mushure mekunge chikwata chisina kupinda muFrench Grand Prix, P139 yakagadziridzwa yakaonekwa paBritish Grand Prix, ine nzvimbo yakawanda, yakawanda yebhuruu uye kuwedzera kusimbisa, ichipa P139 chitarisiko che cylindrical. Motokari yakagadziridzwa yakanga isiri kuvandudzwa pane yepakutanga P139, uye yakatsiviwa neP153 yemwaka wa1970. P139 yakaita kuoneka kumwe kwokupedzisira, pa1970 South African Grand Prix, inotungamirirwa naGeorge Eaton, uyo akanga achibhadhara mari yake, uye nokudaro haana kugamuchira kushanda P153. 