Some highly rated gasoline brands that have met the TOP TIER Detergent Gasoline requirements are brands sold by companies such as BP, Chevron, Exxon, Mobil and Texaco. There are a total of 30 TOP TIER gasoline retailers for the United States as of 2015.
For retailers to be approved by automakers as providing TOP TIER detergent gasoline, they must meet TOP TIER's high standards with all grades of gasoline. All gasoline outlets carrying the approved retailer's brand must also meet those standards.
The TOP TIER detergent gasoline standards were established with the intention of preventing the use of low-quality additive packages in gasoline that can cause deposits to build up on fuel injectors and intake valves.