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Oilteq, I share your concern regarding phosphorous from ZDDP causing catalytic converter damange and emissions problems, mostly because I've been using Amsoil in my cars, which has higher ZDDP levels than current SAE service classes allow (I believe it's a PAO or alkene synthetic base stock). I decided that protecting the engine is a higher priority than protecting the catalytic converter, though, when I decided to make the change.
John
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