I’ve been putting Sinclair gas in my BMWs, Mercedes and Audis for years. Sinclair Oil is one of the oldest oil companies in the US – started in 1916. They own oil fields, production facilities, pipelines, distribution and gas stations. The Bradley Sinclair stations here in Denver have some of the lowest gas prices in town, and never a quality issue. As others have mentioned, there is very little difference between brands of fuel. They market their additives under different brand names but they all do the same thing.