Quote:
Originally Posted by tiegsd
I'd be interested to know what drove the choice of ZDDP content for the LT-5 and whether it's valve train design is a more or less (or neither) severe case in terms of valve train loading and wear compared to older flat tappet OHV engine designs.
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It's generally accepted to be less severe than high performance pushrod engines. It's probably equal to or more severe than low performance pushrod engines.
However, emissions equipment life drove the ZDDP content for all API approved engine oils. Zinc deposits can reduce catalytic converter life. Interestingly, I haven't found any great articles on how much zinc reduces the catalyst life by how much.