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Unless there is something DRASTICALLY wrong with the engine management system, you should NOT have any substantial carbon buildup. That is an old-car symptom.
Even if you did it could not be enough to do anything to the valves except possibly stick one open a bit. But I really doubt it.
Regular oil changes? Fairly clean oil? Using oil too long causes it to lose its cleaning properties and it entrains carbon, combustion products, moisture, etc and will lead to acid formation, accelerated wear and gummed up lifters.
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George Downs, Bartlesville, Heart of the USA!
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