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People used to use automatic transmission fluid in much the same way. The theory is the stuff dissolves/loosens carbon build-up around the valves which might be allowing blow-by.
In the early 70s, a buddy of mine bought a 350 Nova from a fellow who had feather-footed it through it's first year. Proud new (and may I say young) owner took it out to see what it would do and was rewarded with nasty noises from the combustion chambers. A mechanic friend poured 1/2 a can of ATF down the carb throat until it stalled, waited a bit while he changed the plugs, and started it up. That car blew carbon flakes for a couple of miles after that. No other problems. Cheap "de-coking" as they used to call it.
Les
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Les
My train of thought has been replaced by a bumper car.
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