Saturn SL2 carbon buildup suspected in cylinder walls and valves, inquiry about effectiveness of fuel injector cleaners on Saturn SL2

Some Saturn SL2 owners report experiencing issues with carbon buildup in the cylinder walls and valves, which can affect engine performance. These owners note that the effectiveness of fuel injector cleaners can vary, particularly in direct injected engines where fuel does not pass over the intake valves, potentially limiting the cleaner's ability to remove carbon deposits. Additionally, while products like Lucas Fuel Injector Cleaner can help address problems related to poor fuel quality and clogged injectors, some users find that specialized cleaners such as Gumout High Mileage Fuel Injector Cleaner are more effective for vehicles with over 75,000 miles, as they target carbon deposits on injectors, intake valves, and ports. Furthermore, Chevron Techron Concentrate Plus is often recommended for its comprehensive cleaning capabilities across various engine components. It is crucial for owners to select a cleaner that is appropriate for high-mileage vehicles and specifically designed to tackle carbon buildup to restore engine performance effectively.