A cikin shekarun 1930, an fara samun rashin tabbas game da wanzuwar mai a Saudiyya.Sai dai kuma, sakamakon gano man da Bahrain ta yi a shekarar 1932, Saudiyya ta fara binciken nata.^[41] Abdul Aziz ya ba da izini ga Kamfanin Mai na Standard na California don hako mai a Saudi Arabia.Wannan ya kai ga gina rijiyoyin mai a Dhahran a karshen shekarun 1930.Duk da kasa samun man fetur mai yawa a rijiyoyi shida na farko (Dammam No. 1–6), an ci gaba da hakar mai a Rijiyar ta 7, karkashin jagorancin Masanin ilimin kasa dan kasar Amurka Max Steineke da kuma taimakon Badawiyyan Saudiya Khamis Bin Rimthan.^[42] A ranar 4 ga Maris, 1938, an gano babban mai a zurfin kusan mita 1,440 a cikin Rijiyar No. 7, tare da fitowar yau da kullun cikin sauri.^{[43 <>]} A wannan rana, an hako ganga 1,585 na mai daga rijiyar, kuma bayan kwana shida wannan adadin ya karu zuwa ganga 3,810 a kullum.^[44]A lokacin yakin duniya na biyu da bayan yakin duniya na biyu, yawan man da Saudiyya ke hakowa ya karu sosai, wanda ya kai ga biyan bukatun kasashen kawance.Don haɓaka kwararar mai, Aramco (Kamfanin Mai na Larabawa) ya gina bututun ruwa zuwa Bahrain a cikin 1945.Gano man fetur ya kawo sauyi ga tattalin arzikin Saudiyya, wanda ya sha fama duk da irin nasarorin da Abdulaziz ya samu a fannin soji da na siyasa.An fara samar da cikakken man fetur a cikin 1949, bayan ci gaban farko a 1946 da aka jinkirtar da yakin duniya na biyu .^[45] Wani muhimmin lokaci a cikin dangantakar Saudiyya da Amurka ya faru a cikin Fabrairu 1945 lokacin da Abdulaziz ya gana da shugaban Amurka Franklin D. Roosevelt a cikin jirgin USS Quincy.Sun kulla wata muhimmiyar yarjejeniya, wacce har yanzu tana aiki a yau, na Saudiyya na samar da man fetur ga Amurka a matsayin kariya ga sojojin Amurka na gwamnatin Saudiyya.^[46] Tasirin kudi na wannan hako mai ya yi yawa: tsakanin 1939 zuwa 1953, kudaden shigar mai na Saudiyya ya karu daga dala miliyan 7 zuwa sama da dala miliyan 200.Sakamakon haka, tattalin arzikin masarautar ya dogara sosai kan kudin shigar mai.