If you have oil in CATs, can't you simply... burn it? Or push it through?
My thinking - on cold, start, let it run for maybe 20, 40 seconds. Shut down.
Let it cool off and repeat two or three times. Cold flow will not damage the cats (like excess heat from burning oil).
This way oil will be pushed out and not really burning on the cats.
Then, drive it and let the cats burn the rest.
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