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7 Posts
As a new member, I'm surprised I don't see a thread on the carbon buildup problem of our gasoline direct injection (GDI) engines. Aside from frequent oil changes and using synthetic (low carbon) oil, is there anything else that can be done to mitigate this problem which will start showing up at around 40k to 70k miles? Additives to the gas tank will clean the fuel injectors, but not the valves.