P0420 Cat Code vs. CATACLEAN - I think it worked?

My X is a 2011 with about 107k miles. Ever since I hit 103k or so, I've been getting intermittent P0420 code (passenger side cat). It first turned on for 100 miles on a road trip, and then went away for next 1000. Then it came back on for a week, off for a week, and has been like that for the

I've been getting P0420 codes but have been wiping them using cataclean. Changed my oil yesterday and noticed a deposit of oil. Could this oil build up be the problem? : r/MechanicAdvice

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