* Basis for comparison is versus unadditised petrol. The exhaust gases are related to CO, HC and NOx. Benefits may vary depending on factors such as engine type, driving style, and petrol previously used. Fill is defined as a full fuel tank.    
                        Esso Fuels
Follow the energy through a petrol engine.
Esso Synergy Unleaded fuels are engineered to help remove deposits from intake valves, which helps lead to a smoother air/petrol mixture flow.
It’s here in the combustion chamber where everything comes together.
Esso Synergy Unleaded fuels are designed at a microscopic level to help clean your intake valves.*
The exhaust valves, where combustion gases are discharged.