The company ceased operations in 1987, although BP continued to sell gasoline under the 'Sohio' brand until 1991.

Wallace Trevor Holliday was President of the company from 1928 to 1949 and Chairman of the Board from 1949 until his death on November 7, 1950.

[5] However, the contract included a stipulation that BP would assume majority interest when Standard's share of production from the Prudhoe Bay oilfield in Alaska reached 600,000 barrels per day (95,000 m3/d).

By 1991, BP had rebranded all Sohio and Boron retail stations as 'BP',[7][8][9] except for some marine fuel outlets.

[10] By 1980, Sohio and Boron had 3,400 gas stations in Ohio, Michigan, Pennsylvania, Indiana, Kentucky and West Virginia.

[16] The Boron name was used outside of Ohio in neighboring states, like Michigan, Pennsylvania, Kentucky and West Virginia.

[20] In the 1980s, as many gas stations began converting their vehicle service bays into convenience stores, Sohio wished to continue performing auto maintenance by launching a specialty auto repair shop.

Called Sohio ProCare, these shops were often located near Sohio stations that now had convenience stores instead of auto service and were more specialized compared to traditional auto garages located at gas stations.

The locations were mostly in Ohio, but Sohio did expand the concept into Pennsylvania and North Carolina, where they were known as "Boron ProCare".

BP continued to operate it until selling off the chain to a private investment group in 1999, at which point the shops were simply called ProCare without an oil company prefix and its logo was reverted to its Sohio-era colors.

[22] Following a bankruptcy under the private investment group's ownership, ProCare would ultimately be acquired by Monro Muffler Brake in 2006, and converted the locations to its own brands.