Catalytic Converter Safe Oil?

I have a Chevy Equinox with the infamous 2.4L Ecotec nearing 200k miles. It's a great running engine and I just replaced the timing chain last year. The transmission and body are in good shape so I have no plans to get a different car any time soon.

Now onto the problem: the check engine light came on a few months ago for catalytic converter efficiency then went off within a couple days. It came on a few weeks ago and stayed on. It burns about a quart of oil every thousand miles and has...

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