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Nice article but what they didn’t tell you is most engines are direct injection. The fuel is injected directly into the cylinders and never comes in with the intake valves. It’s like having a bucket of soapy water in your kitchen unless it gets on the floor you are still going to have a dirty floor. Some engines have two injectors per cylinder, a port and a direct injector. Those premium fuel will work on but just direct injected won’t keep the intake valves clean.
What causes carbon on the intake valves is the crankcase ventilation system. It vents gases out of the crankcase and burns it in the cylinders and in doing so carbon is deposited on the intake valves.
Lynwood
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