Quote:
Originally Posted by alwayscode390
The previous owner used the Amsoil ... I am used to Mobil One ... will be doing the full Amsoil swap to all my cars I think.
Would the high zinc be suitable in all applications, or could it actually be worse for some engines? ---
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High zinc (or phosphate), from what I understand, can lead to catalytic converter failure. Automakers push to lower zddp in modern motor oil, from what I understand, was driven by this issue and its implication in emission warranty. So the downside may not be so much for other engines but shortened catalytic converter life may be the outcome.