Will increase Cetane values by up to 6 numbers Contains a keep-clean dose of diesel fuel detergent that keep carbon deposits from forming on injectors and with regular use will clean dirty injectors. In recent years with the advent of ultra-low sulfur diesel (ULSD) and high-pressure common rail diesel injection, internal injector deposits have also become an issue. Regular use of Lucas Cetane Booster will also prevent this new form of deposit.