I had been using cat cleaners with every fill up for years! Sometimes it would work but it was perhaps counterproductive. With all the blowby the catcleaner would get into the oil and thin it out. Then more oil would get burnt and dumped into the catalytic converter. So I fianlly found a way to treat the problem at the source.
I think the CRC cleaner might get to the rings as well. However there was some brown foam coming out of the port where I was spraying the Seafoam into.
The O2 sensor did go back to spikeing after driving for a while but the check engine light is still off.
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