Quote:
Originally Posted by Gjg064
The real issue is the EGR function the ECU is programmed on the engine to reduce emissions, the carbon builds up above the oil control ring pack so I doubt an oil would have any effect on it.
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Yes, direct injection injectors is cleaned primarily by fuel (detergent/additives), but not the intake valves. Valvoline says there may be a small cleaning effect by the oil vapors carried though the EGR system and then cycled back through the combustion chamber again and the intake valves...but they do not claim this oil to be designed for that. This is for the piston rings and other internal engine moving surfaces.
It helps reduce oil burn by freeing up the piston rings so they seal again, this restores compression...and stops/reduces blow-by.