Serving motorists since 1901, Texaco operates an international chain of gas stations and comprises part of the fourth-largest oil company in the world. The gasoline retailer maintains roughly 1,800 locations in the United States and also enjoys prominence in Central America, West Africa, and the United Kingdom. Texaco boasts specialized fuel infused with Techron to help clean and protect vehicle engines. The company also offers motor oil and other lubricants through ownership of the Havoline brand of car care products. In 2001, Chevron Corporation merged with Texaco to form one of the largest oil and gas companies in the world. Texaco contributes to annual revenue of roughly $230 billion and maintains headquarters at the Chevron corporate offices in San Ramon, CA.