1910	Beginning of operations by AOC
1915	First discovery of oil at Khaur by AOC
1922	Commissioning of two small refining units at Morgah near Rawalpindi with the capacity of 2,500 BPD
1937	Discovery of oil in Dhulian and installation of Dubbs and Lummus Plants with the capacity of 5,500 BPD
1968	Discovery of oil at Meyal and Toot oilfields
1978	Incorporation of ARL
1979	Conversion of ARL into a Public Limited Company and its listing on three stock exchanges of the country
1981	Refining capacity was increased by the addition of two distillation units of 5,000 & 20,000 BPD capacity each
1987	Commissioning of dispatches of petroleum products through pipeline to Oil Marketing Companies (OMCs) with computerized metering
1996	Effluent Treatment Plant
1999	Expansion and upgradation project with the installation of Heavy Crude Unit of 10,000 BPD and Catalytic Reformer Complex of 5,000 BPD
2000	Commissioning of Captive Power Plant with the capacity of 7.5 MW
2001	ISO-9001: 2000 certification
2001	Production of Polymer Modified Bitumen (PMB)
2002	ISO-14001 certification
2006	OHSAS - 18001 certification
2007	ISO/IEC 17025:2005 Accreditation
2008	DCS (Distributed Control System) installation at two crude units of 5,000 and 20,000 BPD capacity.
2009	Crude and Product storage capacity enhanced gradually by 70% during the period 2002-2009.
2017	Completion of expansion and upgradation project comprising of a Preflash Unit of 10,400 BPD, Light Naphtha Isomerization unit of 7,000 BPD, Diesel Hydro desulphurization unit of 12,500 BPD, related auxiliary units (Hydrogen manufacturing, Sulphur Recovery, Sour Water Stripper & Amine Treating unit) and Utilities units. Capacity enhancement of Captive Power Plant by 18 MW.