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But the old way of having it suck into a vacuum hose is a little dangerous. Go too aggressive and you could hydrolock the motor. I've had the motor make a pinging/knocking sound as it stalled. Have not done it since.

Just go WOT for 5-6 seconds at least a couple times every 200 miles. These engines loaf along at 1500-2000 RPM normally, they need to be worked a little harder to clear the carbon out.

Al
 

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Prolong the hydrolock for an hour? As that seafoam is sitting for an hour, it is likely leaking past the rings into the oil, so keep that in mind.

Al
 
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