Shell's nitrogen-enriched diesel fuel is available, on a trial basis, at select fueling depots across the country. For now, that means commercial and retail customers at Shell stations located in ...

and it contains the highest concentration of proprietary detergents of the three grades of gas you'll find at Shell stations. The brand name of those detergents is "Nitrogen Enriched Cleaning ...

BP promoted an “Invigorate” fuel additive with environmental benefits. Shell’s “Nitrogen Enriched Cleaning System” claimed to produce less emissions. And ExxonMobil advertised fuel that ...