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Zinc ppm vs. Cats
It's a good question. Certainly high levels of phosphorus can coat the catalytic converter(s) but how high ppm is too high for either phosphorus or zinc? If we look at the October 2019 edition of the Mobil 1 Product Guide (attached) we can see the zinc and phosphorus parts per million (ppm) for the M1 oils sold in the USA.
The M1 15W50 has 1300 ppm of zinc and the M1 5W50 FS X2 (that I used to run before moving to BE Bearings) has 1100 ppm of zinc. In summary, I don't know how much zinc ppm is too high to damage catalysts with long term use, but I'll bet the oil companies do, because the M1 Racings oils listed are in the ~1800 zinc ppm levels.
See screenshot and M1 Product Guide attached below.
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