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Restore will not fix stuck piston rings. Most blow by is caused by carboned up piston rings. Auto-Rx will dissolve that carbon and get the rings to seal against the cylinder walls. It will not repair worn metal but nothing out there will.
I had a rough idle in my 960 and with in 500 miles the Auto-Rx got rid of it.
I haven't had it come back in the last 24K miles either.
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