Rislone? Sea Foam? None?

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Tonka, "Sea Foam" is really not an oil additive. It usually goes directly into the intake through the throttle body or ingested via a vacuum line. It is a good product to clean a carbon-ed head, but I would not in general use it as an additive. All the additives you need are right there in the oil.
 
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If using a full synthetic motor oil there is no need for any oil additive.



An intake cleaning using the vacuum line and swab is a good deal...

Todd Z
 

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