In 1969 British American amalgamed with its subsidiaries into a new company called Gulf Oil Canada Limited.

The British American Oil Company was founded in Toronto, Ontario, in 1906 by Albert Leroy Ellsworth (1876–1950).

He was born in Welland, Ontario, and had worked for 9 years at Standard Oil's Acme Refinery in Buffalo, New York.

The company was organized with a Province of Ontario Charter dated October 17, 1906, and its first office building was located at the corner of King and Yonge Streets in Toronto.

The company refined imported crude oil and its main product was kerosene; a then-useless by-product was gasoline, which was dumped into a swamp.

[3][4] In the 1930s, B/A established its own fleet of tanker ships to operate on the Great Lakes: The Britamoil (photo), the Britamolene, the Britamette, the Britamlube, and the Britamaco.

[2] During the Second World War, the Clarkson, Ontario plant was modified to produce aviation fuel, the B/A tanker fleet was redirected for cross-Atlantic service, and B/A completed the Montreal–Portland pipeline to provide year-round delivery of crude oil from Venezuela to the Montreal East Refinery.

B/A constructed a gas re-pressurizing and recycling system at Longview, Alberta to conserve the declining resources of the Turner Valley Field.

In 1966, B/A sold its remaining US assets, the British-American Oil Producing Company, to Dallas-based Chared Corporation.

Gulf started purchasing British American stock in the 1940s, making an initial acquisition of 247,672 shares, and later raising its stake to 2,322,811.

Canadian Gulf had considerable unused write-offs, and thus British American was able to decrease its income tax by $29.7 million.