Kammala wannan jumlar: Don kakar 1986, Murray ya tsara ƙarancin ƙarancin BT55 chassis, wanda burin shi ne ya rage rage motar motar da kuma rage cibiyar nauyi. BMW ta samar da injin M12/13/1, wanda aka karkata zuwa gefe don dacewa da ƙaramin sararin da aka ware wa injin. Duk da fa'idodi na ka'ida, BT55 ya tabbatar da rashin gasa, yana fama da rauni mai rauni da kuma gazawar inji da yawa da ke haifar da matsalolin tsabtace mai a cikin injin da aka karkata. Bugu da ƙari, ƙungiyar ta sha wahala mutuwar Elio de Angelis a cikin haɗarin gwaji bayan tsere huɗu; wanda ya maye gurbinsa Derek Warwick da kuma ƙungiyar da suka dawo Patrese sun ci maki biyu a tsakanin su a duk kakar. Har ila yau, ƙungiyar Arrows ta koma baya, ta zira kwallaye guda ɗaya tare da Boutsen, Surer da Christian Danner, kuma sun rasa ayyukan Surer a tsakiyar kakar wasa lokacin da direban Switzerland ya ji rauni sosai a cikin hadarin haɗari. Abokan haɗin gwiwar BMW mafi nasara a 1986 shine tare da sabon ƙungiyar Benetton, wanda ya ci maki 19, ya lashe gasar
Gasar Cin Kofin Mexico kuma ta dauki matsayi biyu tare da Berger da Teo Fabi. Arrows da Benetton sun ci gaba da amfani da asali na "a tsaye" na M12 / 13 engine.