Quote:
Originally Posted by 4JawChuck
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.
However MMO in the fuel does the trick, you can check via a spark plug pull and camera inspection of the piston tops.
At 60 000kms my pistons were choked with carbon down to the oil control rings.
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Yes, carbon build up inside the combustion chamber best addressed with fuel additives in direct injection engines. Carbon could cause premature detonation as well...misfire. But oil may slip past the piston rings into the combustion chamber, depending on clearances/wear. So this Valvoline oil's cleaning inside the combustion chamber and on the intake valves are not the primary method it was designed for...but may clean via oil blow-by effect....which may or may not amount to anything substantial depending on your engine's wear and your EGR/PCV system.
At next spark plug change I will remind myself to check inside the chamber with a camera...good idea.