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Originally Posted by Fes128
Is there a process similar to this available for an N51?
Thanks in advance.
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The N51 is not a direct injection engine and so it will not have carbon buildup anywhere close to those of the n54's pictured above. Fuel actually passes over the valves in the n51 engine which helps keep them clean. That being said to keep your valves and ports as clean as possible, it is best to use top tier gasoline (something with detergents like techron) and use some fuel additives/ cleaner every now and again.