Quote:
Originally Posted by FlamingRectumSyndrome
Are either of these safe for the catalytic converter?
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Phosphorus is what kills cats by bonding with the catalyst. That's why the EPA forced a reduction of ZDDP in motor oils in the US.
Even if ashless two stroke oil were high in phosphorus (which I don't think it is), a capful of it in your gas tank wouldn't put enough phosphorus into the exhaust to have any effect at all on the cat.