Where does gunky build-up on an engine come from?
Carbon deposit build-up on critical engine parts is the result of various chemical processes that occur in the engine during its operation. These processes can create a residue, which consists of carbon particles that may build up on intake valves and fuel injectors. Shell Nitrogen Enriched Gasolines are designed to act as a barrier to help keep your engine clean and protect it from this performance-robbing gunk even better than before.
