Izinjini ze-GTL Cummins azaziwa nje kuphela ngokuthembeka kwazo, ukuqina kanye nomnotho wezinga eliphezulu, kodwa futhi zihlangabezana nokukhishwa kwegesi okuqinile kwezimoto (US EPA 2010, Euro 4 kanye no-5), ukukhishwa kwemishini yezimoto eziphuma emgwaqweni onguthelawayeka (Isigaba 4 sesikhashana/Isiteji) IIIB) kanye nokukhishwa kwebhodi lemikhumbi (izindinganiso ze-IMO IMO) kube ngumholi wemboni emqhudelwaneni oshubile.