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Good point Belkins. Some of the sludge removed by the treatment could make things looser. Hopefully though, the hydraulic lifters will work more effectively at valve timing, and make better combustion than what scansinboy now has.
The inherent constant reversal of keystone style rings will wear the ring boss toward the inside of the piston. If their is substantial carbon buildup there (in the groove) cleaning that out could make the rings go toward the piston. Proper ring end gap will prevent that, and the rings will go back to scraping as they are supposed to do. Typical high mileage cylinder taper will create the blow by into the crankcase and the bottom line is, rebuild time.
Bottom line as mechanics say, "Pay me now, or pay me later". If you can squeeze out another year, you're set. But, ah the caveat, you are buying, and wasting, quarts of oil, polluting the air, and in some states, you the individual cannot sell a car that won't pass emissions.
I still need to know the make, model, year of the car, and the state it is located.
One more thing, dumping alchohol into the system is one of the four common destroyers of a cat.
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