Editing Gasoline (section)

===Detergents===
Gasoline, as delivered at the pump, also contains additives to reduce internal engine carbon buildups, improve [[combustion]] and allow easier starting in cold climates. High levels of detergent can be found in [[Top Tier Detergent Gasoline]]s. The specification for Top Tier Detergent Gasolines was developed by four automakers: [[General Motors|GM]], [[Honda]], [[Toyota]], and [[BMW]]. According to the bulletin, the minimal U.S. [[Environmental Protection Agency|EPA]] requirement is not sufficient to keep engines clean.<ref>"Top Tier Detergent Gasoline (Deposits, Fuel Economy, No Start, Power, Performance, Stall Concerns)", GM Bulletin, 04-06-04-047, 06-Engine/Propulsion System, June 2004</ref> Typical detergents include [[Amine#Classification of amines|alkylamines]] and [[alkyl phosphate]]s at a level of 50–100 ppm.<ref name="Ullmann2" />