Not all. My Tacoma had additional injectors in the intake manifold to clean the valves.Apparently all direct injection engines have this issue from all manufacturers. Typically it won’t be an issue until the engine has in excess of 150,000 miles on it or so, depending on driving style, fuel quality used, etc. I have an ecoboost vehicle with around 120,000 miles and no issues have manifested from carbon buildup on valve stems so far. Some have offered that installation of an oil catch can can mitigate the carbon buildup issue.
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