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I think the major petroleum company's sell their products with everything your engine needs...
Putting "snake oil" additives in the mix is just a waste of money and potentially harmful.
A good Injector cleaner once a year is probably a good idea...
As for engine cleaners like seafoam...not in my engines!!
I've torn down engines of mine with over 200,000km on them, and there is absolutely no sludge anywhere, or carbon buildup...Just a nice, even tan discolouration in the combustion chambers.
I run Mobile 1 synthetic, and nothing else....
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