The former BP 2go petrol station on the corner of Jones Street and Anzac Parade is undergoing a facelift.
Mobil is set to take over the site and will open in mid-July following the completion of upgrades at the site.
New owner Onil Gulati is in charge of several other Mobil-branded sites, in Morrinsville, Wairoa, Te Rapa and Frankton.
He is also developing stations in Whakatane and Kumeu.
Gulati said he was proud to bring Mobil back to Whanganui.