PSO is Pakistan's largest oil marketing company, established in 1974. It has a network of over 3,500 filling stations and supplies fuel to 9 airports and 2 seaports. PSO imports, stores, and distributes a range of petroleum products across Pakistan. It faces problems like government interference limiting its ability to build new refineries, forcing it to refine crude oil abroad and increasing product prices. PSO aims to become more customer-oriented by establishing a dedicated customer service department to quickly address complaints.